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David Hammen
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272 Answers

Votes Activity Newest
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
4
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
28
Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933?
Sep 26 '20 at 10:59
4
How are sulfuric acid clouds able to completely cover Venus?
Sep 22 '20 at 13:05
8
What would happen when the speed of the Sun's spin changes?
Sep 21 '20 at 22:14
1
What is the difference between these various Angular Resolution formulas?
Sep 20 '20 at 18:02
7
Why is the sunset at different times at the same longitude at equinox?
Sep 14 '20 at 19:41
31
How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity?
Sep 14 '20 at 16:10
7
Instantaneous gravity in equation of motion for ephemerides calculation
Sep 12 '20 at 23:21
16
When did scientists discover that the Sun has a life cycle and that it is going to die?
Sep 11 '20 at 13:32
2
Why both sunrise and sunset use the position of the sun's upper limb?
Sep 9 '20 at 6:05
3
What is 'surface acceleration' of a planet or other body? As opposed to its 'g' (gravity)?
Sep 6 '20 at 16:43
3
How to find the mass of a planet not knowing the gravitational constant?
Sep 3 '20 at 6:59
8
Why is 3GHz the best frequency at which to measure the sun's microwave output?
Aug 27 '20 at 14:58
5
Is the “mean orbit” centered on ellipse center or ellipse focus?
Aug 25 '20 at 16:06
7
How to retrieve from NASA Horizons site the needed data to plot analemmas for other planets?
Aug 20 '20 at 12:50
3
Have Earth, Mars and Jupiter and Neptune not cleared their orbits of space debris?
Aug 18 '20 at 13:36
2
Air molecules per cubic foot at a certain altitude above the surface
Aug 17 '20 at 11:21
3
Could there be a planet at the barycenter between two or more stars revolving around each other?
Aug 16 '20 at 1:43
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