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lighthouse1234
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Why is it that I can still use my 10 year old planisphere, if the stars are in motion?
From what moving position?lighthouse1234 said:From that moving position ...
The stars in constellations are so far away that they can be moving tremendously fast and we will not be able to notice it with the naked eye in our lifetime. The nearest star in Orion is Bellatrix, which is 250 light years away. A light year is 5.8 trillion miles. The farthest star in Orian is Alnilim, which is 1360 ly away. So the change in angle will be small unless/until they move very far sideways or up and downlighthouse1234 said:Why is it that I can still use my 10 year old planisphere, if the stars are in motion?
There's a source!lighthouse1234 said:Someone wrote this to me
If I stand far away from the train tracks near my house and watch a train go by, the train appears to move very slowly. If I hold my thumb up it takes about a second for the train to 'cross' behind it. But if I stand next to the tracks the train will cross behind my thumb in a small fraction of a second.lighthouse1234 said:Someone wrote this to me: From that moving position these 'fixed stars' seem to be stationary,
hence are actually moving, even if they seemingly do not.
"There's that guy again, trying to hitch a ride on our train..."Drakkith said:But if I stand next to the tracks the train will cross behind my thumb in a small fraction of a second.