Search found 7 matches
- Tue Feb 21, 2012 4:00 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Anticrepuscular Rays Over Wyoming (2012 Feb 21)
- Replies: 20
- Views: 3828
Re: APOD: Anticrepuscular Rays Over Wyoming (2012 Feb 21)
I am sorry, but the APOD explanation is erroneous. It has nothing to do with Great Circles. Great Circles are curves around a sphere - these rays are parallel straight lines. I found a better explanation a few years ago: Parallel straight lines appear to converge looking in either direction. If you ...
- Mon Jun 06, 2011 5:06 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Geometers Playground Over Wyoming (2011 Jun 06)
- Replies: 65
- Views: 43272
Re: APOD: Geometers Playground Over Wyoming (2011 Jun 06)
You get to see yourself coming and going on Monument Rd!
- Wed Jun 01, 2011 3:52 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Jets from Unusual Galaxy Centaurus A (2011 May 31)
- Replies: 16
- Views: 3654
Re: APOD: Jets from Unusual Galaxy Centaurus A (2011 May 31)
I found the term "light" quite off-putting since nothing in the image was visible light. Electromagnetic radiation I believe is the best term. It is not the light spectrum, but the electromagnetic spectrum. If you were writing this for fourth graders "light" would be fine. I have...
- Mon Feb 28, 2011 1:38 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Saturns Hyperion: A Moon with Odd... (2011 Feb 27)
- Replies: 32
- Views: 4904
Re: APOD: Saturns Hyperion: A Moon with Odd... (2011 Feb 27)
Looks more like honeycomb than sponge or coral to me. Maybe the honeycomb structure is an artifact of Hyperion's formation and not impacts. Some form of outgassing, or???
- Fri Dec 10, 2010 3:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Twilight Occultation (2010 Dec 10)
- Replies: 18
- Views: 2901
Re: APOD: A Twilight Occultation (2010 Dec 10)
Great photo! Brings back fond memories of an occultation of Saturn I observed shortly after I had made my first six inch Newtonian (circa 1961/62) back in Indiana. I was able to see the whole show - entrance and exit. My favorite part was the emergence (or disappearance) from the dark limb of the mo...
- Sun Dec 05, 2010 5:01 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Anticrepuscular Rays Over Colorado (2010 Nov 28)
- Replies: 42
- Views: 4582
Re: APOD: Anticrepuscular Rays Over Colorado (2010 Nov 28)
Interesting discussions. Sometimes it is good just to ENJOY the photo or the phenomenon. I first noticed this display while driving in eastern Oregon with my stepson. I stopped the car and we stood there wondering why the rays were reconverging toward the opposite horizon ... They should keep diverg...
- Fri Dec 03, 2010 6:07 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Dark Belt Reappearing on Jupiter (2010 Nov 29)
- Replies: 34
- Views: 3606
Re: APOD: Dark Belt Reappearing on Jupiter (2010 Nov 29)
Chris, you mentioned cyclic but without regular periodicity. It would be interesting to know how often this phenomenon has occurred. Someone must be keeping recent records. I checked my old log and I saw a one-band Jupiter on January 18, 1990. I am not a regular observer - You get out of the habit l...