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David Hammen
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241 Answers

Votes Activity Newest
10
Gravitational waves and gamma ray burst: how were the error bars determined for this speed of gravity calculation? Was $H_0$ used?
yesterday
3
Can a high enough density ignite a gas giant into a brown dwarf?
Jul 27 at 4:13
5
What exactly is a “conclusive association” in Astronomy?
Jul 26 at 7:07
4
What effects does the motion of the Sun have on the perihelion precession of Mercury?
Jul 24 at 9:38
2
What's the equation for moon-moon tidal heating?
Jul 23 at 17:25
17
Why don't the inner moons of Jupiter have tidally-induced volcanism?
Jul 20 at 12:32
4
Why Comet C/2020 F3 Neowise returns even it's orbit is near- parabolic?
Jul 18 at 12:00
7
What does BJD-2450000 mean?
Jul 17 at 15:31
12
Julian Day Calculation
Jul 17 at 12:44
6
Is the gravitational field of the sun uniform?
Jul 4 at 21:28
37
Why is there so little nitrogen in the Martian and Venusian atmospheres?
Jul 3 at 3:34
20
Why are there no terrestrial planets with a subsurface ocean?
Jun 24 at 1:06
10
How to explain this trajectory of the moon taken from the same spot on Earth over 28 days?
Jun 24 at 0:19
3
Converting rectangular to polar coordinates
Jun 23 at 10:49
30
What will the PRECISE time of the Summer Solstice 2020 be?
Jun 20 at 19:23
3
What direction does 0° in the J2000 epoch point towards on January 1, 2000?
Jun 18 at 23:34
9
How strong are the tides raised by Io on Jupiter relative to the ones raised by the Moon on Earth?
Jun 16 at 1:18
9
Why doesn't the moon always follow the same path? Or why aren't the moon's apoapsis and periapsis fixed?
Jun 5 at 9:14
2
Why isn't there a large gap in the number of captured moons Jupiter and Saturn have?
May 27 at 22:05
12
Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?
May 23 at 12:40
8
Why does Saturn have a more prominent equatorial bulge and higher flattening ratio than Jupiter despite rotating slower?
May 23 at 10:53
23
Why does the Parker Solar Probe slow down as the distance from the Sun increases?
May 22 at 1:17
3
Why are telescopes positioned in Lagrange points?
Apr 28 at 18:16
5
So, what, exactly, is a tropical period?
Mar 21 at 18:25
3
Latitude, longitude and altitude of Ckoirama Observatory; where can things like this be looked-up?
Mar 19 at 13:59
3
Why is there no concavity in the orbit of the moon around the Sun?
Mar 10 at 17:58
4
How many members of the IAU typically attend votes?
Feb 18 at 14:13
7
How does gravity affect a physical clock?
Feb 5 at 18:26
8
Path of Mercury and general relativity
Jan 27 at 13:52
13
What is Charon's ascending node in reference to?
Jan 27 at 13:00
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