Skip to main content
Space Exploration
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz
  • Member for 8 years
  • Last seen this week
  • Pennsylvania, United States
Profile Activity
Stats
1,233
reputation
19k
reached
13
answers
0
questions
Communities
View all
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.

Badges
View all badges
1
gold badge
8
silver badges
14
bronze badges
Top tags
View all tags
27
Score
4
Posts
31
Posts %
23
Score
1
Posts
8
Posts %
18
Score
3
Posts
23
Posts %
18
Score
1
Posts
8
Posts %
18
Score
1
Posts
8
Posts %
18
Score
1
Posts
8
Posts %
Top posts
View all questions and answers
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
4
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
3
Was Roadster (Starman) seen in Earth orbit, before the long burn to deep space?
Nov 2, 2018
Top network posts
View all network posts
108
If Earth is tilted, why is Polaris always above the same spot?
41
Why do satellites arcs end abruptly when observed from Earth
35
Did I see a supernova explosion?
30
Moon moving near horizon much faster than at zenith, reason? error?
22
Does the sun's rising/setting angle change every few months?