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As Earth spins faster than it has in decades, atomic clocks are catching the difference, and shorter days are on the horizon.
In the Northern Hemisphere, if a star’s declination is greater than 90° degrees minus your latitude, that star will never set. We call it a circumpolar star.
In the Southern Hemisphere, if a star's declination is less than the latitude minus 90°, the star will be circumpolar. The post Michael's Miscellany: Coordinates appeared first on Astronomy Magazine.
R ight ascension is based on the apparent rotation of the sky as Earth spins — 360° in 24 hours, or 15° per hour. The concept dates at least from the time of Hipparchus (190-120 b.c.).Right ...
Bad Astronomy Happy Winter Solstice! By Phil Plait. Dec 21, 2012 7:30 AM. Just a science tip. ... declination measures a star’s position north or south of the celestial equator ...
Unusual signals from pulsating radio sources have been recorded at the Mullard Radio Astronomy Observatory. The radiation seems to come from local objects within the galaxy, and may be associated ...