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by An'shur
10 Aug 2018 06:57
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

JackDole , Yes, the third example seems impossible, at least not with one epicycle. I attemped it, but the planet is slowest near the ellipse focal points. If you imagine the epicycle's (I used a barycenter) orbital period to be 1 and that of the planet -1, then you get an ellipse with the Sun in t...
by An'shur
10 Aug 2018 03:07
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

JackDole , I cannot outright claim that your approach with the first configuration is incorrect either. But unlike your second gif, the binary stars in the video have retrograde orbits. (Which should not be a problem in SE at all anyway) The next examples: To me the green market orbit of the two st...
by An'shur
10 Aug 2018 02:43
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

Watsisname wrote:
An'shur wrote:
Qr Bbpost I might have been overlooked 

Sorry An'shur -- I didn't overlook it, but I don't know of the answer offhand.  I may try to figure it out when I have the opportunity.

Nevermind, I'll wait. ;)
by An'shur
09 Aug 2018 10:32
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

I came across an interesting video. I am wondering how could I calculate the orbital period of the configuration at 3:32. I know all of these are three body orbits which are unstable, but the one I am interested in appears to be doable in Space Engine. 8_RRZcqBEAc Edit: https://upload.wikimedia.org...
by An'shur
08 Aug 2018 03:59
Forum: Space Journeys
Topic: The "That Totally Looks Like _____" Thread
Replies: 88
Views: 14694

The "That Totally Looks Like _____" Thread

Terraformed Mars look-alike

Image
by An'shur
06 Aug 2018 10:06
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

I came across an interesting video. I am wondering how could I calculate the orbital period of the configuration at 3:32. I know all of these are three body orbits which are unstable, but the one I am interested in appears to be doable in Space Engine. 8_RRZcqBEAc Edit: https://upload.wikimedia.org/...
by An'shur
04 Aug 2018 06:16
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1063
Views: 96853

Science and Astronomy Questions

Epicycles are also "right" if you keep adding enough of them I came across this nice illustration how any orbit can be described by epicycles: QVuU2YCwHjw Wow...  Speaking of epicycles, I created this impossibility. https://imgur.com/a8wccle.gif https://i.imgur.com/Y6xxN1o.jpg The epicycl...
by An'shur
01 Aug 2018 02:27
Forum: Mods and Addons
Topic: Mods and Addons - Requests, suggestions and ideas
Replies: 264
Views: 40166

Mods and Addons - Requests, suggestions and ideas

A height map of Earth with Greenland and Antarctica without ice would be very interesting.  I do not mean procedural Earth with tweaked weather, which would leave these two landmasses as 2-4k high plateaus. I mean something like this: https://upload.wikimedia.org/wikipedia/commons/8/8b/Topographic_m...
by An'shur
22 Jul 2018 09:51
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 70
Views: 3253

Solar System dynamics discussion thread

A question: If the bodies are really massive (merged?) black holes, could the slopes down from L4 and L5 be so steep so these points become a kind of massless "white" hole?   midtskogen , that is an  amazing  question.  Off hand, my gut feeling is that it cannot, but I do not know for sur...
by An'shur
09 Jul 2018 01:28
Forum: Mods and Addons
Topic: An's Addon Database
Replies: 18
Views: 3395

An's Addon Database

Palauan wrote:
Nice!

Thanks!
by An'shur
06 Jul 2018 04:04
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 70
Views: 3253

Solar System dynamics discussion thread

it is even possible for an object to orbit around... something that has no mass at all!   (Here, there be dragons  Lagrange Points). Could I place the Moon (or a moon in general) to the Lagrangian point between the planet and the parent sun so it casts a permanent solar eclipse shadow on the planet...
by An'shur
05 Jul 2018 10:22
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 70
Views: 3253

Solar System dynamics discussion thread

20886 Is the Moon more strongly atracted to the Sun than to Earth? Reading this question, I though that the obvious answer is no. Moon should be more attracted to Earth, since it orbits it, instead of the Sun. So I checked the  gravitational force calculator . Moon is attracted to Earth with the fo...
by An'shur
03 Jul 2018 08:39
Forum: Mods and Addons
Topic: An's Addon Database
Replies: 18
Views: 3395

An's Addon Database

What if giant planets were closer to the Sun with other planets as their moons? The answer is 12 terraformed worlds, one artificial and Earth tidally locked to Jupiter, with the farthest point from the core, Chimborazo, having Jupiter directly overhead. Added to my database.
by An'shur
27 Jun 2018 04:44
Forum: Space Journeys
Topic: SE Object Extremes
Replies: 203
Views: 26340

SE Object Extremes

In most cases, neutron stars and black holes seem to be accompanied by a brown or red dwarf if in a binary system. The rarest binary star arrangement I stumbled across once was a neutron star (or a black hole) with a main sequence F class star. Has anyone ever found a multiple star with more than on...
by An'shur
12 Jun 2018 13:20
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 220
Views: 39129

Unusual weather

It also lasted long. Formed in the German Alps and over the night, traveled about 700 kilometers northeast before dissipating in the morning.