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Galileo and the Mountains of the Moon
lpetrich
271 views
How Galileo discovered the mountains of the Moon. He observed light spots and dark spots that came and went, and he concluded that he was seeing mountains and their shadows...
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Francesco Sizzi: Jupiter's Moons Cannot Exist
lpetrich
99 views
When Galileo discovered Jupiter's four big moons, Francesco Sizzi argued that they cannot exist with argument that seems totally preposterous by most present-day standards....
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Francesco Sizzi: Jupiter's Moons Cannot Exist (original version)
lpetrich
145 views
When Galileo discovered Jupiter's four big moons, Francesco Sizzi argued that they cannot exist with argument that seems totally preposterous by most present-day standards....
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Jupiter's Big Moons (Slow)
lpetrich
510 views
Jupiter's four big moons around the time that Galileo discovered them. Three weeks of simulated time from his discovery date of January 7, 1610. Slow version (1 frame = 15 ...
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Jupiter's Big Moons (Fast)
lpetrich
1,774 views
Jupiter's four big moons around the time that Galileo discovered them. Three weeks of simulated time from his discovery date of January 7, 1610. Fast version (1 frame = 1 h...
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Titan-Hyperion 4:3 Orbit Resonance
lpetrich
871 views
Titan and Hyperion orbit Saturn with periods of 15.94542 and 21.27661 Earth days, respectively. Their period ratio is very close to 4/3, with Titan making very close to 4 o...
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The Sun from Mercury
lpetrich
3,395 views
Due to Mercury's rotation (1.5 times its orbit rate), and Mercury's eccentric orbit (e = 0.206), the Sun seems almost stationary at its closest point. First above one side,...
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Mercury's Orbit
lpetrich
5,931 views
Mercury orbits the Sun in a noticeably eccentric orbit (e = 0.206), and it also rotates about 1.5 times faster than it orbits (note the red marker). Each Mercury day is two...
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Satellite Synchronous Rotation
lpetrich
13,470 views
Many of the planets' satellites rotate synchronously, as fast as they orbit their primaries, thus making one side of them always face their primaries. The Earth's Moon is w...
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Re: The Blasphemy Challenge
lpetrich
307 views
I don't have a webcam, so I made some text frames which I hope are illustrative. And I don't pretend to be a great filmmaker or a great public speaker either. But I had a b...
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