APOD: Super Moon vs Micro Moon (2012 Nov 29)

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Expand view Topic review: APOD: Super Moon vs Micro Moon (2012 Nov 29)

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Raven » Thu Jan 17, 2013 5:40 am

What a great picture of the two hurtling moons of Jasoom, a fine match in every way for the two hurtling moons of Barsoom (Thuria/Phobos and Cluros/Deimos)!

So... the big one's "Luna"... and the little one's what, "Fortuna"? ("... velut Luna...")

Should we presume anything complicated in the way of orbits, or instead a Lagrangian point -- perhaps with Fortuna at stable L4 or L5, a steady 60 degrees respectively ahead of or behind Luna?

The phases would be predictable. We'd get twice as many lunar eclipses, but no additional total solar eclipses, just some partials (umbrals); Luck would be a lady.

Tides, now, the peak tide (between the moons) would be much higher with two moons to draw it. Incoming or outgoing, Luna's would be the stronger, Fortuna's the gentler. Whether tides, like March, "come in like a lamb and out like a lion" or vice versa, depends on whether Fortuna leads or follows Luna.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Beyond » Sat Dec 01, 2012 5:27 am

Chris Peterson wrote:
Beyond wrote:
Chris Peterson wrote:In any case, however, the important point is that there's nothing to suggest that Moses even existed...
I'm sure he wished that was so, because of the hard time the Isrealites gave him. :mrgreen:
You mean, as opposed to the good times Pharaoh gave him...
Maybe... Maybe not... I don't remember much being said about his Egyptian time, and I'm tooo lazy to go look it up. :lol2:

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Chris Peterson » Sat Dec 01, 2012 5:10 am

Beyond wrote:
Chris Peterson wrote:In any case, however, the important point is that there's nothing to suggest that Moses even existed...
I'm sure he wished that was so, because of the hard time the Isrealites gave him. :mrgreen:
You mean, as opposed to the good times Pharaoh gave him...

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Beyond » Sat Dec 01, 2012 2:06 am

Chris Peterson wrote:In any case, however, the important point is that there's nothing to suggest that Moses even existed...
I'm sure he wished that was so, because of the hard time the Isrealites gave him. :mrgreen:

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by neufer » Fri Nov 30, 2012 7:21 pm

Chris Peterson wrote:
I'm quite sure that imaginary characters don't write anything!
http://www.gutenberg.org/catalog/world/readfile?fk_files=1289066&pageno=2 wrote:
  • THE PUBLISHER TO THE READER. [_As given in the original edition_.]

    The author of these Travels, Mr. Lemuel Gulliver, is my ancient and
    intimate friend; there is likewise some relation between us on the
    mother’s side. About three years ago, Mr. Gulliver growing weary of the
    concourse of curious people coming to him at his house in Redriff, made
    a small purchase of land, with a convenient house, near Newark, in
    Nottinghamshire, his native country; where he now lives retired,
    yet in good esteem among his neighbours.

    Although Mr. Gulliver was born in Nottinghamshire, where his father
    dwelt, yet I have heard him say his family came from Oxfordshire;
    to confirm which, I have observed in the churchyard at Banbury in
    that county, several tombs and monuments of the Gullivers.

    Before he quitted Redriff, he left the custody of the following papers in
    my hands, with the liberty to dispose of them as I should think fit. I
    have carefully perused them three times. The style is very plain and
    simple; and the only fault I find is, that the author, after the manner
    of travellers, is a little too circumstantial. There is an air of truth
    apparent through the whole; and indeed the author was so distinguished
    for his veracity, that it became a sort of proverb among his neighbours
    at Redriff, when any one affirmed a thing, to say, it was as true as if
    Mr. Gulliver had spoken it.

    By the advice of several worthy persons, to whom, with the author’s
    permission, I communicated these papers, I now venture to send them
    into the world, hoping they may be, at least for some time, a better
    entertainment to our young noblemen, than the common scribbles of
    politics and party.

    This volume would have been at least twice as large, if I had not made
    bold to strike out innumerable passages relating to the winds and tides,
    as well as to the variations and bearings in the several voyages,
    together with the minute descriptions of the management of the ship
    in storms, in the style of sailors; likewise the account of longitudes and
    latitudes; wherein I have reason to apprehend, that Mr. Gulliver may
    be a little dissatisfied. But I was resolved to fit the work as much as
    possible to the general capacity of readers. However, if my own
    ignorance in sea affairs shall have led me to commit some mistakes, I
    alone am answerable for them. And if any traveller hath a curiosity to
    see the whole work at large, as it came from the hands of the author,
    I will be ready to gratify him.

    As for any further particulars relating to the author, the reader will
    receive satisfaction from the first pages of the book.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Chris Peterson » Fri Nov 30, 2012 4:52 pm

neufer wrote:If the character is based on an Egyptian nobleman,
it's quite possible that he would have been literate:
Possible, although by no means certain. The question of literacy in ancient Egypt is one of active scholarly research. It is likely that literacy was greatest in the bureaucratic classes, and much less so among the nobility. In a cultures where nobles utilize scribes (as in Egypt) it isn't uncommon to find a sort of semi-literacy: the ability to read, but limited writing skills.

In any case, however, the important point is that there's nothing to suggest that Moses even existed... and I'm quite sure that imaginary characters don't write anything!

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by neufer » Fri Nov 30, 2012 4:26 pm

Chris Peterson wrote:
BDanielMayfield wrote:
Chris, you have great credibility as an accurate source when it comes to astronomy. But Moses, the writer of Genesis who was educated in the court of an Egyptian Pharaoh is thought to have completed this book by about 1513 BCE, not a just "a few hundred years BCE", and he may very well have been compiling from earlier written records.
Moses is not recognized as a historical figure, but rather a mythological one. Even if the character is based on an actual person, it is extremely unlikely that he would have been literate. Scholars call the writer of Genesis "the Yahwist", and date the book to somewhere between the 5th and 6th centuries BCE. Of course, the stories are certainly part of an oral tradition stretching much further back than that, but we are discussing writing here. There's little doubt that orally transmitted stories about the Moon extend to the earliest men.
Click to play embedded YouTube video.
If the character is based on an Egyptian nobleman,
it's quite possible that he would have been literate:
http://en.wikipedia.org/wiki/Moses#Psychology wrote:
<<Sigmund Freud, in his last book, Moses and Monotheism in 1939, postulated that Moses was an Egyptian nobleman who adhered to the monotheism of Akhenaten (ca. 1335 BC). Following a theory proposed by a contemporary biblical critic, Freud believed that Moses was murdered in the wilderness, producing a collective sense of patricidal guilt that has been at the heart of Judaism ever since. " Egyptian origin of Moses and of his message has received significant scholarly attention.>>
. http://asterisk.apod.com/viewtopic.php? ... 78#p188532
http://asterisk.apod.com/viewtopic.php? ... es#p141760

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by DavidLeodis » Fri Nov 30, 2012 1:11 pm

The image of the Super Moon on the left is dated May 5 2012 but May 6 2012 is given in the explanation for that Moon. I notice two others have queried this but there has been no response. I assume the difference might be due to local times, but the differing dates are still confusing. It would be helpful if, in addition to their date, the time (in Universal Time) that the two images of the Moon were taken had been given. I'm also amazed at just how quickly these images were used in an APOD, which does make me wonder what time that reported to have been taken on November 28 was taken. They are nice images though and illustrate the apparent size difference well.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by saturno2 » Fri Nov 30, 2012 1:43 am

Super Moon and Micro Moon
Apogee and perigee
The aparent size of the Moon.
But beautiful forever

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Chris Peterson » Fri Nov 30, 2012 12:06 am

BDanielMayfield wrote:Chris, you have great credibility as an accurate source when it comes to astronomy. But Moses, the writer of Genesis who was educated in the court of an Egyptian Pharaoh is thought to have completed this book by about 1513 BCE, not a just "a few hundred years BCE", and he may very well have been compiling from earlier written records.
Moses is not recognized as a historical figure, but rather a mythological one. Even if the character is based on an actual person, it is extremely unlikely that he would have been literate. Scholars call the writer of Genesis "the Yahwist", and date the book to somewhere between the 5th and 6th centuries BCE. Of course, the stories are certainly part of an oral tradition stretching much further back than that, but we are discussing writing here. There's little doubt that orally transmitted stories about the Moon extend to the earliest men.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by BDanielMayfield » Thu Nov 29, 2012 11:55 pm

FloridaMike wrote:It's a tough crowd Bruce :wink:
It is even so, FloridaMike, and greetings from the other side of the Gulf. Your friendly reply made it worth the flaming arrows.
Chris Peterson wrote:Genesis only dates to a few hundred years BCE. There are Babylonian cuneiform tablets with astronomical data for the Moon that considerably predate that.
Chris, you have great credibility as an accurate source when it comes to astronomy. But Moses, the writer of Genesis who was educated in the court of an Egyptian Pharaoh is thought to have completed this book by about 1513 BCE, not a just "a few hundred years BCE", and he may very well have been compiling from earlier written records.

Bruce

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by retrogalaxy » Thu Nov 29, 2012 10:32 pm

To me when i saw it yesterday, it was not "micro". The Moon was low in the sky at the close end of afternoon, it has a good contrast (or a better brightness for eyesight).

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Beyond » Thu Nov 29, 2012 9:49 pm

FloridaMike wrote:
BDanielMayfield wrote:
BDanielMayfield wrote:One of the oldest written records of our Moon in a written form is found at Genesis 1:16 where this object is referred to as "the lesser luminary for dominating the night". I'm grateful that our lesser luminary exists and that its orbit is such that eclipses are so wonderfully varried.

Bruce
Please note correction.

It's a tough crowd Bruce :wink:
EGADS!! The Great Quotidian Quotationist left out 'one' word of the quote :?: :?: :?: :?: The Horror of it all :!: How will we ever get over it :?:
I know... Lets all give him 'one' of these---> :P

EDIT... Everyone just ignore this post!! I didn't realize that the post neufer quoted had been edited AFTER he quoted it. Sorry bout that neufer. :oops:
So now i get to have bad razzberry desert! :chomp:

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by FloridaMike » Thu Nov 29, 2012 9:07 pm

BDanielMayfield wrote:
BDanielMayfield wrote:One of the oldest written records of our Moon in a written form is found at Genesis 1:16 where this object is referred to as "the lesser luminary for dominating the night". I'm grateful that our lesser luminary exists and that its orbit is such that eclipses are so wonderfully varried.

Bruce
Please note correction.

It's a tough crowd Bruce :wink:

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by bystander » Thu Nov 29, 2012 9:00 pm

Tszabeau wrote:The Moon's wobble is, also, made apparent in these two photos by plotting and comparing landmark craters.
http://asterisk.apod.com/viewtopic.php?p=188007#p188007

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Anthony Barreiro » Thu Nov 29, 2012 7:07 pm

Tszabeau wrote:The Moon's wobble is, also, made apparent in these two photos by plotting and comparing landmark craters.
I noticed this too. Following up on Neufer's lunar etymology from wikipedia, "wobble" seems to be a fine Germanic root word, while "libration" has that sophisticated Latinate vibe. :ssmile:

I recently had an "aha" moment: The Moon's north-south libration is caused by the inclination of her equator relative to the plane of her orbit around the Earth. Seasons on Earth are caused by the inclination of the Earth's equator to the plane of her orbit around the Sun. The Moon's east-west libration is caused by the eccentricity of her orbit around the Earth. The slowing down and speeding up of true solar noon on Earth relative to mean solar noon (i.e. the equation of time) is caused by the eccentricity of Earth's orbit around the Sun. As above, so below!

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by bystander » Thu Nov 29, 2012 6:58 pm

geckzilla wrote:I find it difficult to believe that the Bible contains the first written record of anything other than its own mythology.
Even the basis for that can be found in preexisting mythologies dating back to the dawn of mankind.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by BDanielMayfield » Thu Nov 29, 2012 6:44 pm

BDanielMayfield wrote:One of the oldest written records of our Moon in a written form is found at Genesis 1:16 where this object is referred to as "the lesser luminary for dominating the night". I'm grateful that our lesser luminary exists and that its orbit is such that eclipses are so wonderfully varried.

Bruce
Please note correction.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by LocalColor » Thu Nov 29, 2012 6:41 pm

It was cloudy here for the lunar minimum, however we could see the bright spots of both the moon and Jupiter very near each other through the clouds.

Last May we caught the maximum.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Remo » Thu Nov 29, 2012 5:55 pm

John A. wrote:Can anyone tell me the difference in the light reflected from the moon between the maximum and minimum apparent sizes of the moon when it is full?
The amount of light reflected is always the same; however, I'm sure you mean the amount of light reaching your eyeball or illuminating the night landscape. This varies based on the inverse square law. (It also corresponds the "solid angle" the moon makes against the celestial background. At its perigee the moon takes up 25% more space against the background)

According to Wiki, Apogee is 405,400 km and Perigee is 362,600 km (using 4 sig figs). This means the difference in the amount of light is (4054/3626)^2 = 1.25 =125%. So at its Perigee, the full moon shines 25% more light back to earth.

Magnitude is a logarithmic scale which comes closer to mimicking how the human brain interprets "brightness". But if you are interested in the amount of light whether it be for taking an image or running a photo voltaic cell, or whatever, this is your answer.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Boomer12k » Thu Nov 29, 2012 5:54 pm

It's the Energizer Rabbit in the Moon.

Great comparison shot.

:---[===] *

He who is without Sin....

by neufer » Thu Nov 29, 2012 5:09 pm

Chris Peterson wrote:
geckzilla wrote:
I find it difficult to believe that the Bible contains the first written record of anything other than its own mythology.
Yeah, Genesis isn't even close to the earliest written reference to the Moon. Genesis only dates to a few hundred years BCE.
There are Babylonian cuneiform tablets with astronomical data for the Moon that considerably predate that.
http://en.wikipedia.org/wiki/Sin_%28mythology%29 wrote: <<Sin (Akkadian: Su'en, Sîn) or Nanna (Sumerian: DŠEŠ.KI, DNANNA) was the god of the moon in the Mesopotamian mythology of Akkad, Assyria and Babylonia. Nanna is a Sumerian deity, the son of Enlil and Ninlil, and became identified with Semitic Sin. The two chief seats of Nanna's/Sin's worship were Ur in the south of Mesopotamia and Harran in the north.

He is commonly designated as En-zu, which means "lord of wisdom". During the period (c.2600-2400 BCE) that Ur exercised a large measure of supremacy over the Euphrates valley, Sin was naturally regarded as the head of the pantheon. It is to this period that we must trace such designations of Sin as "father of the gods", "chief of the gods", "creator of all things", and the like. The "wisdom" personified by the moon-god is likewise an expression of the science of astronomy or the practice of astrology, in which the observation of the moon's phases is an important factor.

An important Sumerian text ("Enlil and Ninlil") tells of the descent of Enlil and Ninlil, pregnant with Nanna/Sin, into the underworld. There, three "substitutions" are given to allow the ascent of Nanna/Sin. Sin's wife was Ningal ("Great Lady"), who bore him Utu/Shamash ("Sun") and Inanna/Ishtar (the goddess of the planet Venus). The tendency to centralize the powers of the universe leads to the establishment of the doctrine of a triad consisting of Sin/Nanna and his children.

Sin had a beard made of lapis lazuli and rode on a winged bull. The bull was one of his symbols, through his father, Enlil, "Bull of Heaven", along with the crescent and the tripod (which may be a lamp-stand). On cylinder seals, he is represented as an old man with a flowing beard and the crescent symbol. In the astral-theological system he is represented by the number 30 and the moon. This number probably refers to the average number of days (correctly around 29.53) in a lunar month, as measured between successive new moons.
Image
Nanna's chief sanctuary at Ur was named E-gish-shir-gal ("house of the great light"). It was at Ur that the role of the En Priestess developed. This was an extremely powerful role held by a princess, most notably Enheduanna, daughter of King Sargon of Akkad, and was the primary cult role associated with the cult of Nanna/Sin.

Sin also had a sanctuary at the Assyrian city of Harran, named E-khul-khul ("house of joys"). The cult of the moon-god spread to other centers, so that temples to him are found in all the large cities of Babylonia and Assyria. A sanctuary for Sin with Syriac inscriptions invoking his name dating to the 2nd and 3rd centuries CE was found at Sumatar Harabesi in the Tektek mountains, not far from Harran and Edessa.>>
Art (bull is one of his symbols) Neuendorffer

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by bystander » Thu Nov 29, 2012 5:06 pm

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by Chris Peterson » Thu Nov 29, 2012 4:53 pm

geckzilla wrote:I find it difficult to believe that the Bible contains the first written record of anything other than its own mythology.
Yeah, Genesis isn't even close to the earliest written reference to the Moon. Genesis only dates to a few hundred years BCE. There are Babylonian cuneiform tablets with astronomical data for the Moon that considerably predate that.

Re: APOD: Super Moon vs Micro Moon (2012 Nov 29)

by neufer » Thu Nov 29, 2012 4:29 pm

geckzilla wrote:
I find it difficult to believe that the Bible contains the first written record of anything other than its own mythology.
http://en.wikipedia.org/wiki/Khonsu wrote:
ImageImage
[c]Khonsu is typically depicted as a mummy with the symbol of childhood,
a sidelock of hair, as well as the menat necklace with crook and flail.
He has close links to other divine children such as Horus and Shu.
He is sometimes shown wearing a falcon's head like Horus,
with whom he is associated as a protector and healer,
adorned with the sun disk and crescent moon.[/c]
<<Khonsu (alternately Chonsu, Khensu, Khons, Chons or Khonshu) is an Ancient Egyptian god whose main role was associated with the moon. His name means "traveller" and this may relate to the nightly travel of the moon across the sky. Along with Thoth he marked the passage of time. Khonsu was instrumental in the creation of new life in all living creatures. At Thebes he formed part of a family triad with Mut as his mother and Amun his father.

Khonsu is mentioned in the Pyramid Texts (2686 BC – 2181 BC) and Coffin Texts (ca. 2181-2055 BC), in which he is depicted in a fierce aspect, but he does not rise to prominence until the New Kingdom (ca. 1550–1070 B.C.), when he is described as the "Greatest God of the Great Gods". Locations of Khonsu's cult were Memphis, Hibis and Edfu. Most of the construction of the temple complex at Karnak (c. 1550–c. 1292 BC) was centered on Khonsu during the Ramesside Period. His temple at Karnak is in a relatively good state of preservation, and on one of the walls is depicted a cosmogeny in which Khonsu is described as the great snake who fertilizes the Cosmic Egg in the creation of the world.

As the god of light in the night, Khonsu was invoked to protect against wild animals, increase male virility, and to aid with healing. It was said that when Khonsu caused the crescent moon to shine, women conceived, cattle became fertile, and all nostrils and every throat was filled with fresh air. Khonsu can also be understood to mean king's placenta, and consequently in early times, he was considered to slay the king's (i.e. the pharaoh's) enemies, and extract their innards for the king's use, metaphorically creating something resembling a placenta for the king. This bloodthirsty aspect leads him to be referred to, in such as the Pyramid texts, as the (one who) lives on hearts.

Khonsu is typically depicted as a mummy with the symbol of childhood, a sidelock of hair, as well as the menat necklace with crook and flail. He has close links to other divine children such as Horus and Shu. He is sometimes shown wearing a falcon's head like Horus, with whom he is associated as a protector and healer, adorned with the sun disk and crescent moon. In art, Khonsu was depicted as a man with the head of a hawk, wearing the crescent of the new moon subtending the disc of the full moon. He was sometimes pictured on the back of a goose, ram, or two crocodiles. His sacred animal was the baboon, considered a lunar animal by the ancient Egyptians.>>

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