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David Hammen
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289 Answers

Votes Activity Newest
2
Accuracy of calculating the vernal equinox?
Apr 6 at 10:43
25
What do astronomers do different now that they know about fusion of the Sun?
Mar 24 at 5:41
22
Why won't the Sun set for days at N66.2 which is below the arctic circle?
Mar 23 at 1:21
1
Why are solar systems stable and not chaotic?
Mar 7 at 3:14
3
Apsides Calculation
Mar 7 at 2:11
2
How can a very old star be formed among Population III stars?
Mar 4 at 0:13
6
Why does Wikipedia state that the Solar System has one unconfirmed planet?
Mar 2 at 12:14
5
What exactly was the Moon's “Evection Resonance”?
Feb 25 at 21:47
2
How much lighter would someone be on the Jupiter-facing side of Io?
Feb 22 at 18:22
3
What's the reason the Astronomical twilight doesn't have constant time?
Feb 21 at 9:09
3
Earth's precession and the position of the Sun in the sky
Feb 12 at 16:22
19
Is it possible that the Sun and all the nearby stars formed from the same nebula?
Feb 11 at 5:03
30
How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth?
Feb 8 at 9:07
22
Why would the side of the moon that faces earth be as dark as the far side of the moon?
Feb 7 at 10:46
5
After a supernova, why don't new stars coalesce with higher heavier element content?
Feb 6 at 18:34
21
The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?
Jan 30 at 11:14
1
What does the amino acid found in the atmosphere of Venus mean?
Jan 24 at 11:49
4
Would an object placed at L1 be seen in front of the Sun from Earth?
Jan 5 at 22:43
3
Semi-major axis vs. apogee and perigee of orbit
Dec 28 '20 at 16:39
10
Where did the hydrogen come from in a type II supernova?
Dec 15 '20 at 11:14
0
Why is the Sun less massive than other G2V stars?
Dec 8 '20 at 15:53
26
Do our sun and moon have names?
Nov 30 '20 at 14:29
16
What are “non-Keplerian” orbits? What are some familiar examples in our solar system, and can some still be closed?
Nov 3 '20 at 3:19
7
Why Trojans haven't merged into moons
Oct 20 '20 at 9:30
3
Does the Sun and Moon basically appear to “move on the sky” identically regardless of location and date?
Oct 17 '20 at 13:42
5
What instruments are used to measure the distance to the Sun?
Oct 7 '20 at 15:11
2
Before the 1761 transit, what was our best estimate of the distance to the Sun?
Oct 6 '20 at 16:25
2
Is it still the case that the transit of Mercury can't be measured with sufficient accuracy to determine the Sun's distance?
Oct 3 '20 at 17:22
5
Cannot identify mistake in calculating orbital eccentricity vector; magnitude equals one instead of zero (with python code)
Sep 29 '20 at 14:43
31
How was the mass of Venus determined?
Sep 27 '20 at 15:19
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