Ultimate space simulation software

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by midtskogen
13 Aug 2018 12:02
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

Watsisname wrote:
Qr Bbpost This should definitely be close enough to get really interesting direct data

Yes.  I felt a need to copy in something from Sunshine here. :)
by midtskogen
12 Aug 2018 23:20
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 235
Views: 25325

Astrophotography

I looked for Perseids between 22:20 and 23:10 last night as stars began to appear.  The sky was still pretty bright, but Perseids can also be bright.  Still, nothing.  Checking my cameras this morning, there was one a few minutes after I went in.  Then roughly 4-5 fairly weak ones per hour and one f...
by midtskogen
12 Aug 2018 14:24
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 235
Views: 25325

Astrophotography

I can't explain the blue cloud, but awesome picture, pzampella!
by midtskogen
10 Aug 2018 07:32
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 729
Views: 91048

Totally off-topic thread

Movie trailer for upcoming Norwegian animation film.  I though the Russian Babushka design for the rocket was pretty good. :)

by midtskogen
09 Aug 2018 05:26
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

Watsisname wrote:
Qr Bbpost If a ship is in a circular orbit at exactly 1.5 times the planet's radius (this is 3185km altitude for Earth), then its clocks will tick at exactly the same rate as clocks on the planet surface.

For a planet and moon system with equal density, isn't that coincidentally also the Roche limit?
by midtskogen
08 Aug 2018 04:15
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

Interesting.  So, one could say that the Earth's bulge around the equator is a relativistic effect?
by midtskogen
08 Aug 2018 00:22
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

Thanks.  I suspected it was more complicated, but not that the altitude would more than cancel it, since 10km is not much at the scale of the earth.  There's another thing to consider: latitude.  It's perhaps the most important variable?
by midtskogen
07 Aug 2018 00:21
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

I calculated that I've spent just over a week airborne over the past 12 months covering a distance of about half a light second.  Does this also mean that I've travelled half a second further into the future than if I'd remained at home, or is the maths more complicated?
by midtskogen
07 Aug 2018 00:14
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

If no other processes at play in the universe prevent it, iron ought to become the most abundant element, since fission releases energy for lighter elements and fusion consumes energy for heavier elements.
by midtskogen
05 Aug 2018 04:28
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

A problem with Ptolemy's epicycles was that they lacked a good way to explain the speed changes of planets.  Then Kepler discovered that the orbits can be modelled as ellipses (of which the circle is a special case), and he could also describe the speed in his second law, which was a really beautifu...
by midtskogen
04 Aug 2018 14:11
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

Fourier's discovery has had a great impact.  All audio and video compression (and hence almost 80% of internet traffic) relies on the principle of transforming the signal to be compressed to the frequency domain, reduce the data in that domain, then transfer it back.  Just like fewer epicycles requi...
by midtskogen
03 Aug 2018 14:19
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1059
Views: 96472

Science and Astronomy Questions

midtskogen wrote:
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:
by midtskogen
03 Aug 2018 06:08
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 235
Views: 25325

Astrophotography

I think the misconception is that the ice crystals that form the halo are not fixed. Each combination of observer and light source has its own light deflecting crystals, whilst the light angles remain fixed. Les Cowley tells me that good crystals need to be at least 10 to 20 microns, and noctilucent...
by midtskogen
03 Aug 2018 03:51
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 235
Views: 25325

Astrophotography

I got data from several cameras, so the path can be calculated: a.jpg And it's altitude: b.jpg Finally it's orbit: c.jpg Summary : [table][tr][td]Start height: 115,5 km End height: 83.3 km Start position: 60.365N 11.212E End position: 60.067N 10.626E Direction: 224.6° Incidence: 34.9° Entry speed: 5...
by midtskogen
02 Aug 2018 15:18
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 235
Views: 25325

Astrophotography

Not only noctilucent clouds last night, but also an exploding meteor bright enough to create a halo.  Could it be the ice crystals of the nocilucent clouds?  Or just in ordinary high altitude haze.

EDIT: This was a Perseid.

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