Friday, January 20, 2012

How many and which constellations can we see in the sky tonight from Earth?

and how does this depend on what time it is in the night?



please describe.



Thanks for your answers!How many and which constellations can we see in the sky tonight from Earth?What if I wasn't from Earth....could I still answer this question?How many and which constellations can we see in the sky tonight from Earth?Yes, it depends on the time of night. Here's what I see tonight.



6 pm. About 25 constellations in the sky, including Capricornus, Aquila, Hercules, Piscis Austrinus, Aquarius, Equulus, Delphinus, Sagitta, Vulpecula, Cygnus, Lyra, Draco, Ursa Minor, Cepheus, Lacerta, Cassiopeia, Pegasus, Pisces, Cetus, Triangulum, Aries, Perseus, Camelopardalis, Taurus, and Auriga.



8 pm. The first few on the list above have set, but Gemini, Orion, and Eridanus have risen in the east.



10 pm. Some more in the west have set, but Cancer, Monoceros, and Ursa Major have risen.



12 midnight. More have set in the west, but Canis Major, Canis Minor, and Leo have risen in the east.



I'll skip ahead to 6 am. I can now see Hydra, Corvus, Sextans, Crater, Bootes, Corona Borealis, and look, here's Hercules, reappearing above the Sun, having disappeared 12 hours earlier!



You can see almost all the constellations visible from your latitude in a single winter night, except for a handful where the Sun itself is located, mainly Scorpius, Sagittarius, and Ophiuchus. I can only see constellations down to about 45掳 south declination, because the ones farther south never rise above my horizon, but I've travelled to Australia to see them: Crux, Centaurus, Carina, and many more,
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