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Space Exploration
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz
  • Member for 6 years, 6 months
  • Last seen this week
  • Pennsylvania, United States
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About

I have been an amateur astronomer since the late 1970's. I enjoy observational astronomy, mathematics, and spaceflight. Cosmology and astrophysics are not as interesting to me.

In the past, I observed occultations (total and grazing lunar, asteroidal) and variable stars. Since my free time is limited now, I mostly enjoy watching satellites pass over.

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Top posts
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All Questions Answers
Score Newest
answer
23
Who filmed the Apollo 11 trans-lunar injection?
May 5, 2019
answer
18
Are cherry-pickers a new thing in spaceflight?
Aug 19, 2021
answer
13
Exit film of moon landing departure
Dec 31, 2018
answer
8
How often does a geostationary satellite enter into a Lunar shadow?
Jan 10, 2019
answer
6
How far away can spacecraft be seen with an optical telescope?
Jan 7, 2019
answer
5
Historical Moon’s True Anomaly Numbers
May 23, 2022
answer
3
Will the real Snoopy please stand up?${}^†$ Has the candidate object for Apollo 10 lunar module been publicly identified?
Jun 17, 2019
answer
3
How to calculate the local maximum solar radiation on Mars from day to day throughout a full martian year?
Aug 12, 2020
answer
3
Launch Elements
Apr 27, 2021
answer
2
What is/was Spitzer's schedule for end-of-life and what will be its final status?
Feb 1, 2020
Top network posts
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107
If Earth is tilted, why is Polaris always above the same spot?
41
Why do satellites arcs end abruptly when observed from Earth
34
Did I see a supernova explosion?
21
Does the sun's rising/setting angle change every few months?
15
Why moon sighted only in Kerala but not in rest of India?

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