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Galactic Navigation
Longitude & the Crab Nebula
Now lets compare the locations of the Crab
Nebula. On the black and white map, it is the bright orange source all the
way to the right.
On the Degrees Longitude diagram, it is near 180o.
Now imagine yourself standing on Earth and looking at the galactic center.
Suppose you want to then look at the Crab Nebula. You would have to either go to
the other side of the Earth to see it (because you can't see through the Earth!),
or you would have to wait for the Earth to spin around so that you are facing the
opposite direction. Why do you think you won't be able to see the Crab Nebula if
you are looking toward the galactic center?
(hint: compare the location of the Crab on each diagram:
Degrees Longitude, Degrees Latitude diagram and Black and White map)
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