Search found 4 matches

by twc
Sat Oct 01, 2011 5:55 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Asteroids Near Earth (2011 Oct 01)
Replies: 35
Views: 6355

Re: APOD: Asteroids Near Earth (2011 Oct 01)

Does this image represent only asteroids found in the orbital plane of the earth? Wouldn't a two dimensional image representing a three dimensional space show some higher densities toward the center of the image, assuming that the gravitational effect of the sun would draw them into a spherical shape?
by twc
Sat Sep 13, 2008 2:49 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Planets over Perth (APOD 12 Sep 2008)
Replies: 14
Views: 4465

I thought because Mercury had an orbit so close to the sun that it almost never appeared in the night sky. In this photograph it appears so far above the horizon... I can visualize the angles that would create that scenario but I have never seen it that far away from the sun before.
by twc
Mon Aug 27, 2007 9:06 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: No eclipse? (APOD 26 August 2007)
Replies: 7
Views: 2949

Now I understand. Thank you for the explanation.
by twc
Mon Aug 27, 2007 3:14 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: No eclipse? (APOD 26 August 2007)
Replies: 7
Views: 2949

Question about the diagram linked from the APOD page

I wondered if the chart linked from the APOD page might be for a solar eclipse. Since the size of the shadow cast by earth's umbra is greater than the size of the moon then it would cover the entire surface area of the moon. How would it be possible for it to obscure varying degrees of lunar visibil...