Author Topic: Astronomy and the Heavens  (Read 962 times)

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Gd5150

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Re: Astronomy and the Heavens
« Reply #15 on: September 28, 2018, 02:49:24 PM »
Cool website calculates when the ISS will pass in front of the Moon/Sun allowing one to take on the challenge of photoing said transit. Also some good examples.

https://transit-finder.com

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Re: Astronomy and the Heavens
« Reply #16 on: December 26, 2018, 07:20:14 PM »
Wrap you head around this one...

How Earth Moves...


Dyna-X

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Re: Astronomy and the Heavens
« Reply #17 on: December 27, 2018, 01:24:19 PM »
Wrap you head around this one...

How Earth Moves...


Some really amazing graphics in this one. Now if you really want to get dizzy imagine this helix with paths of the Voyager spacecrafts as the trajectories were being bounced off the outer planets. They had this calculated out to Neptune to a matter of seconds to what was calculated a decade earlier. To top it off each planet had a different angle to the plane of the ecliptic so being even a fraction of a degree in error would have been a show stopper.

Obviously they use sidereal time to plan reception with tracking antennas.





Sofia

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Re: Astronomy and the Heavens
« Reply #18 on: December 28, 2018, 12:04:11 AM »
Some really amazing graphics in this one. Now if you really want to get dizzy imagine this helix with paths of the Voyager spacecrafts as the trajectories were being bounced off the outer planets. They had this calculated out to Neptune to a matter of seconds to what was calculated a decade earlier. To top it off each planet had a different angle to the plane of the ecliptic so being even a fraction of a degree in error would have been a show stopper.

Obviously they use sidereal time to plan reception with tracking antennas.


Can I get a summary?  He is a lot to get through.

Robert

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Re: Astronomy and the Heavens
« Reply #19 on: December 29, 2018, 06:03:23 PM »
that's the big reason i want to move out of the city..can't see any good star events
That's one of the reasons I did...but lately the lights have been catching up!

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Re: Astronomy and the Heavens
« Reply #20 on: January 05, 2019, 10:36:32 PM »
China on the Moon

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Rikki Gins

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Re: Astronomy and the Heavens
« Reply #21 on: January 06, 2019, 01:53:12 AM »
China on the Moon

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Fascinating.  And on the far side of the moon at that.  https://www.space.com/42914-china-far-side-moon-landing-crewed-lunar-plans.html

Dyna-X

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Re: Astronomy and the Heavens
« Reply #22 on: January 06, 2019, 06:59:04 PM »
Fascinating.  And on the far side of the moon at that.  https://www.space.com/42914-china-far-side-moon-landing-crewed-lunar-plans.html

Maybe this will springboard the US return to the Moon. What most folks don't know was that Apollo and the space race was a product of the Cold War. Without this history, the Moon probably would not have visited by more than a dozen or so probes at this point.

Dyna-X

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Re: Astronomy and the Heavens
« Reply #23 on: January 09, 2019, 12:06:04 PM »
Another picture from the Chang'e 4 Moon lander from the Von Karman crater on the lunar far side.(Taken just before the one above) The brown tint is not an anomaly. Various moon rocks and soils have varied from white, grey, brown, and light green and sometimes this is enhanced by lighting and the viewing angle.
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albrecht

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albrecht

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