All Questions
11
questions
1
vote
1
answer
124
views
Identify the bright object to the left of the moon
I'm seeing the sky at 23:00 on September 29, 2023, from the east of Algeria's point of view. To the left of the moon, there is something very bright. I need to confirm if it's Jupiter?
(My camera ...
- 13
18
votes
3
answers
4k
views
What is this 877-year cycle in the orbits of Jupiter & Saturn, and this multimillion-year cycle in the lunar orbit?
The book The Theory That Would Not Die (by Sharon Bertsch McGrayne, 2011) states the following on page 28:
He [Pierre-Simon Laplace] used other methods between 1785 and 1788 to determine that Jupiter ...
- 323
1
vote
1
answer
274
views
Can I use 75mm Plano convex lens to build telescope [closed]
I want to see Jupiter with moon.
So am planning to build telescope. Can I use 75mm Plano convex lens with 1000mm focal length?
3
votes
1
answer
636
views
How big and how far away would the moon be if earth was the size of Jupiter?
If the earth were the size of Jupiter, what would its 'moon' be in both relative size and distance? I did some quick figuring and think I roughly figured out that if placed at the position of the sun, ...
5
votes
2
answers
267
views
Solar wind, Earth wind and planetary winds?
In February 2021, a new form of "electrified gas breeze" was announced, see blog by Tony Phillips entitled A New Form of Space Weather: Earth Wind which might a possible explanation for ...
- 5,636
1
vote
0
answers
130
views
Meteor size and frequency distribution for Earth vs. moon or other planets?
I struggle to find an answer to the at-first-sight simple question if or how the size distribution and frequency distribution of incoming rocks hitting the ground or the atmosphere vary from Earth, to ...
- 5,636
2
votes
1
answer
206
views
How to understand this multi-day exposure photograph of Jupiter and the Moon
This answer includes a stunning photo of the Moon and Jupiter "Trails of the Shifting Moon" by photographer Jin Lu.
The caption reads:
From the photographer: "I spent 4 days capturing the trail of ...
- 30.7k
7
votes
2
answers
743
views
Computing orbit positions of Jovian Satellites / Moons using JPL data
I've been trying to build a model of the solar system in a game. Thus far I've succeeded in placing each of the planets in position using Keplerian elements and formulae from https://ssd.jpl.nasa.gov/...
- 211
1
vote
1
answer
218
views
What should I improve my telescope kit to see more details of Moon?
What should I improve my telescope kit to see more details of Moon?
I have the gskyer telescope of 60mm aperture and 350mm focal length.
my eyepieces are 10mm,25mm.
and I have x3 Barlow.
my best ...
- 31
3
votes
1
answer
357
views
Eclipses of Jupiter's Moon during Retrograde motion
When Jupiter is undergoing retrograde motion as seen from the Earth, would you expect the eclipses of Jupiter’s moons to occur several minutes early, several minutes late, or neither?
Can someone ...
- 31
10
votes
2
answers
8k
views
What would happen if Jupiter and Earth were at the same distance as the Moon is from Earth?
If Spock came with a super machine capable of moving planets, and placed Earth so close to Jupiter as the Earth's moon, the gravity of Jupiter would make us fall into it?
- 785