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Astronomy
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JohnHoltz's user avatar
JohnHoltz's user avatar
JohnHoltz
  • Member for 8 years, 5 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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107
If Earth is tilted, why is Polaris always above the same spot?
Apr 28, 2019
41
Why do satellites arcs end abruptly when observed from Earth
Dec 26, 2018
35
Did I see a supernova explosion?
Sep 12, 2020
30
Moon moving near horizon much faster than at zenith, reason? error?
Aug 1, 2023
23
Does the sun's rising/setting angle change every few months?
Nov 4, 2020
15
Why moon sighted only in Kerala but not in rest of India?
Jun 14, 2018
13
Does this photo show the "Little Dipper" and "Big Dipper"?
Dec 17, 2020
12
How does the Moon look like from different latitudes of the Earth?
Jan 29, 2018
11
How is this the last supermoon of 2019?
Mar 21, 2019
11
Are there any galaxies visible in the night sky around the Orion constellation?
Nov 1, 2019

Top network posts

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23
Who filmed the Apollo 11 trans-lunar injection?
18
Are cherry-pickers a new thing in spaceflight?
13
Exit film of moon landing departure
8
How often does a geostationary satellite enter into a Lunar shadow?
6
How far away can spacecraft be seen with an optical telescope?