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Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. The solar radius is usually defined as the radius to the layer in the Sun 's photosphere where the optical depth equals 2/3: [ 1 ]
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 ...
The ancient Greeks observed that the appearance of Sirius as the morning star heralded the hot and dry summer and feared that the star caused plants to wilt, men to weaken, and women to become aroused. [30] Owing to its brightness, Sirius would have been seen to twinkle more in the unsettled weather conditions of early summer. To Greek ...
A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale). The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles).
The angles involved in these calculations are very small and thus difficult to measure. The nearest star to the Sun (and also the star with the largest parallax), Proxima Centauri, has a parallax of 0.7685 ± 0.0002 arcsec. [19] This angle is approximately that subtended by an object 2 centimeters in diameter located 5.3 kilometers away.
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Those days leading up to summer can feel like they take forever. But it's well worth the wait for those annual beach trips, extra-fun pool parties, and days filled with summer fruits (and ...
Planetoid Pallas passed Sirius, the brightest star in the night sky, on October 9 to the south at a distance of 8.5 arcminutes (source: Astrolutz 2022, ISBN 978-3-7534-7124-2). As Sirius is far south of the ecliptic only few objects of the solar system can be seen from earth close to Sirius.