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Points of reference

22 Jun 2014, 00:00 UTC
Points of reference
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If you're an astronomer who's going to find your way around the sky or describe where you saw something, you need to know some important points of reference. Continue reading →

¡SkyCaramba! Weekly astronomy blog for the week ending June 28, 2014
If you’re an astronomer who’s going to find your way around the sky or describe where you saw something, you need to know some important points of reference.
I don’t suppose I have to tell you what is meant by north, south, east, and west. If you know an object will be in the east, you look in the direction the sun and moon rise in. It’s probably worth noting, however, that when an astronomer says an object is moving northward, he or she usually means it’s moving toward the north celestial pole. That may not be due north or north at all compared to objects on the earth.
If you wish to specify than an object is overhead, it is at the zenith. And if it’s beneath your feet on the other side of the earth, it’s at the nadir. The horizon is that line that makes a big circle around you between the earth and sky. ...

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