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The study of celestial objects and phenomena outside of the Earth's atmosphere.

26 votes
6 answers
9k views

Is there an astronomical reason behind the order for the names of days of the week?

The seven days of the week seems to be commonly named after celestial bodies. What I find curious is that all seven days apparently share the same names in both West and East. Sunday is, of course, …
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  • 605
23 votes
2 answers
6k views

When did it become possible to predict the time and place of solar eclipses?

That is, when did astronomy figure out how to predict when and where a solar eclipse will be visible? …
Semaphore's user avatar
  • 605