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Words related to sidereal

si·de·re·al
S s

  • sidereal time

    time measured by the diurnal motion of stars. A sidereal day is about four minutes shorter than a solar day, with hours, minutes, and seconds all proportionally shorter.

  • hour angle

    the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body.

  • month

    Also called calendar month. any of the twelve parts, as January or February, into which the calendar year is divided.

  • precession of the equinoxes

    the earlier occurrence of the equinoxes in each successive sidereal year because of the slow retrograde motion of the equinoctial points along the ecliptic, caused by the precession of the earth's axis of rotation; a complete precession of the equinoxes requires about 25,800 years.

  • sidereal day

    the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.

  • sidereal hour angle

    the angle, measured westward through 360°, between the hour circle passing through the vernal equinox and the hour circle of a celestial body.
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