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Right ascension - Topic:Astronomy - Online Encyclopedia ... Corresponding to longitude, we have right ascension which is measured eastwards (never westwards) round the sky. The zero-point of right ascension, corresponding to Greenwich, is a point with the mysterious name of The First Point Of Aries.
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en.mimi.hu/astronomy/right_ascension.html
en.mimi.hu/astronomy/right_ascension.html
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thus, 1 hour of right ascension is equivalent to 15 degrees of (apparent) sky rotation. ... The zero point for celestial longitude (that is, for right ascension) is the Vernal Equinox, ... When the Sun is at one of the equinoxes the lengths of day and night are equivalent (equinox derives from a root meaning "equal night").
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csep10.phys.utk.edu/astr161/lect/time/coordinates.html
csep10.phys.utk.edu/astr161/lect/time/coordinates.html
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EXPLANATION RA is the celestial equivalent of terrestrial Longitude . Both RA and longitude measure an east-west angle along the equator; ... The concept of Right Ascension has been known at least as far back as Hipparchos who measured stars in equatorial coordinates in the 2nd century BC. But Hipparchos and his...
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www.seattleluxury.com/encyclopedia/entry/right_ascensio...
www.seattleluxury.com/encyclopedia/entry/right_ascension
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and both measure from an arbitrary zero point on the equator. ... An hour of right ascension is equal to 15 degrees of arc, a minute of right ascension equal to 15 minutes of arc, and a second ... RA can be used to determine a star's location and to determine how long it will take for a star to reach a certain point in the sky.
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space.wikia.com/wiki/Right_ascension
space.wikia.com/wiki/Right_ascension
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Bias Calibration – Zero second exposure to calculate the zero point signal level of the detector. ... Right Ascension (RA) – the angular distance east/west on the sky.
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www.csc.uvic.ca/~csmacoop/wtreports/nrc/dao/drew/Glossa...
www.csc.uvic.ca/~csmacoop/wtreports/nrc/dao/drew/Glossary.html
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The same problem applies to the celestial equivalent of longitude, right ascension. Astronomers have chosen the vernal equinox as the zero point for right ascension (RA or the Greek letter alpha: for short).
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www.physics.csbsju.edu/astro/sky/sky.11.html
www.physics.csbsju.edu/astro/sky/sky.11.html
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The location of the Sun in the sky when it crosses the celestial equator is also called an equinox. In the celestial equatorial coordinate system, the vernal equinox has right ascension and declination equal to zero.
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home.att.net/~srschmitt/siderealtime.html
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There is something in the sky corresponding to longitude on Earth. The corresponding coordinate in the sky is called right ascension. Unlike longitude, ... For objects outside the solar system, the light year (ly) is often used. This is the distance light travels in a year, One light year is equal to 63,240 AU.
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cse.ssl.berkeley.edu/segwayed/lessons/findplanets/coord...
cse.ssl.berkeley.edu/segwayed/lessons/findplanets/coordinates.html
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