American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Of, relating to, or concerned with the stars or constellations; stellar.
- adj. Measured or determined by means of the apparent daily motion of the stars: sidereal time.
Century Dictionary and Cyclopedia
- Pertaining or relating to the constellations or fixed stars; consisting of or constituted by fixed stars: as, the sidereal regions; sidereal calculations; a sidereal group or system. Sidereal distinctively refers rather to stars in the aggregate or as arranged in constellations or groups than to a star considered singly. It is, therefore, not a precise synonym of stellar or astral, and still less, of course, of starry; although in many phrases it is interchangeable with stellar. Thus, the “sidereal spaces” are the “stellar spaces,” and “sidereal gold” is “starry spangles.”
- adj. Of or relating to the stars.
- adj. astronomy Relating to a measurement of time relative to the position of the stars.
- adj. astronomy Relating to a measurement of time relative to the point of the vernal equinox.
GNU Webster's 1913
- adj. Relating to the stars; starry; astral.
- adj. (Astron.) Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars
- adj. of or relating to the stars or constellations
- adj. (of divisions of time) determined by daily motion of the stars
- Latin sidereus, from sidus, sider-, star (Wiktionary)
- From Latin sīdereus, from sīdus, sīder-, constellation, star. (American Heritage® Dictionary of the English Language, Fourth Edition)
“This is the difference between what we call the sidereal day (the time that it takes to make one complete rotation) and the synodic day (the time that it takes to go from the Sun highest in the sky until the Sun is again at its highest in the sky).”
“Kepler, Galileo, and Newton in the seventeenth century, were the means of effecting a rapid advance in the science of astronomy; but that branch of it known as sidereal astronomy was not then in existence.”
“It's called sidereal or Vedic astrology, and it's popular in India.”
“What they are probably thinking is that the imaginary line mentioned above from the earth to the sun sweeps out a full circle in one year; this is called a sidereal year: the time it takes for the sun to appear in the same place against the backdrop of the fixed stars.”
“Indeed, little was known of those orbs until within the past hundred years, when the exploration of the heavens by the aid of greatly increased telescopic power, was the means of creating a new branch of astronomical science, called sidereal astronomy.”
“The time which the earth occupies in making a complete rotation around this axis is called a sidereal day.”
“As in connection with 1: 7 the idea of a kind of sidereal ocean had to be rejected as a purely fanciful notion of commentators, so here.”
“While I agree that talking about the misogyny is important, it's kind of sidereal to the point I was trying to make, which was that my childhood and teen years as a trans person shaped my socialization and upbringing in ways that aren't acknowledged.”
“The whole sidereal system coruscated, reeled and fell in flame.”
“In other words, everybody has two signs - one linked to the seasons (Western tradition) and the other more closely linked to the constellations (sidereal).”
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