Tag Archives: stellar parallax

Retrograde motion

Like the ancients Greeks, I also had some trouble understanding retrograde motion and how it’s possible that it might seem that some objects in the sky move in reverse motion. Instead of rising in the east and setting in the west, it appears that some objects move in reverse from west to east for a […] Continue reading

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Is it a parallax or only one? ;)

So one feature of star observation that has allowed us to figure out that we’re not the center of the universe is this really neat and slightly tricky idea of stellar parallax. It’s the phenomenon where based on our position in orbit, a star may appear to have moved based on the stars behind it. […] Continue reading

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