Skip to main content
Earth Science
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz
  • Member for 4 years, 9 months
  • Last seen this week
  • Pennsylvania, United States
Profile Activity
Stats
262
reputation
755
reached
6
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
This user doesn’t have any gold badges yet.
1
silver badge
7
bronze badges
Top tags
View all tags
7
Score
2
Posts
33
Posts %
5
Score
3
Posts
50
Posts %
4
Score
1
Posts
17
Posts %
4
Score
1
Posts
17
Posts %
4
Score
1
Posts
17
Posts %
3
Score
1
Posts
17
Posts %
Top posts
answer
4
What causes this arc in the night sky where the background is brighter on one side than the other?
Mar 14, 2020
answer
3
What is this Sun and moon photographic anomaly?
Dec 2, 2021
answer
2
How far Kinshasa DRC is tilted away from the solar plane on the summer and winter solstices?
Mar 8, 2022
answer
2
In a picture taken in an unknown location, the sun shines on skyscrapers solely from the right. What direction was the camera facing?
Jul 14, 2022
answer
2
Earth rotation speed on the same longitude
Jan 27, 2023
answer
0
Where does the sun set?
Jul 17, 2023
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?
23
Who filmed the Apollo 11 trans-lunar injection?