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Non-circumpolar stars are visible only during certain days or seasons of the year. The night sky, divided into two halves. Declination (blue) begins at the equator (green) and is positive northward (towards the top), negative southward (towards the bottom). The lines of right ascension (blue) divide the sky into great circles, here 1 hour apart.
The Sun would appear as a white star of apparent magnitude +0.5, [136] roughly the same as the average brightness of Betelgeuse from Earth. It would be at the antipodal point of α Centauri AB's current right ascension and declination , at 02 h 39 m 36 s +60° 50′ 02.308″ (2000), in eastern Cassiopeia , easily outshining all the rest of the ...
The Ancient Greeks thought that Sirius's emanations could affect dogs adversely, making them behave abnormally during the "dog days", the hottest days of the summer. The Romans knew these days as dies caniculares, and the star Sirius was called Canicula, "little dog". The excessive panting of dogs in hot weather was thought to place them at ...
Evolution of the solar luminosity, radius and effective temperature compared to the present-day Sun. After Ribas (2009) [3] The uncrewed SOHO spacecraft was used to measure the radius of the Sun by timing transits of Mercury across the surface during 2003 and 2006. The result was a measured radius of 696,342 ± 65 kilometres (432,687 ± 40 miles).
The Right ascension of the star is about 18 h. 18 h means it is a March early-hours star and in blue sky in the morning. If 12 h RA, the star would be a March all-night star as opposite the March equinox. If 6 h RA the star would be a March late-hours star, at its high (meridian) at dusk.
The average American has $104,000 of debt, which means that each pound is worth about $10K for the 35% who would prefer to lose weight than decrease their debt. Hims 2.
The Summer Triangle in the context of the night sky, with dimmer stars fading out first and then fading in last. From mid-to-tropical northern latitudes: the centre of the triangle appears about overhead around solar midnight during summer, and exactly so at about the 27th parallel north. This means it rises at sunset in the east and sets at ...
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