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JohnHoltz's user avatar
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JohnHoltz
  • Member for 6 years, 1 month
  • 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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3
Are longer days attributable to refraction or spacetime curvature?
May 2, 2021
answer
1
Projectile motion launched at an angle and landing higher than start
Jan 16, 2019
answer
1
Calculating speed of satellite in vacuum?
Mar 16, 2019
answer
1
How to find the reaction force from the joint from a bar supported to a wall where a block is resting?
Aug 15, 2023
answer
0
How can I measure some forces in this experiment...? (statics)
Jan 18, 2019
answer
0
Question about pulley
Feb 4, 2019
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0
What is the reason terminal velocity changes with radius?
Feb 28, 2019
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Free Form Diagram of one block on top of another block
Apr 8, 2020
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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?