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Of or pertaining to astronomy or to observations of the celestial bodies. Also known as astronomic.

tropical year

tropical yearclick for a larger image
The period between two successive vernal equinoxes, the time the earth takes to complete one orbit around the sun relative to the first point of Aries. Its length was 365 days 5 h 48 min and 45.19 s in 2000, and it is changing by 0.00000006162 x y days (y in Julian years from 2000), or about 5 milliseconds/year. The tropical year differs from the solar year by 1 part in 26,000, since this is the period of the earth's precession about its rotational axis combined with the precession of the perihelion of the earth's orbit. Also called an astronomical, equinoctial, natural, or solar year. It contains one complete cycle of seasons.


The period of incomplete darkness following sunset and preceding sunrise. Twilight is designated as civil, nautical, or astronomical, as the darker limit occurs when the center of the sun is 6°, 12°, and 18°, respectively, below the celestial horizon. The period of civil twilight before sunrise is known as morning civil twilight and after the sunset as evening civil twilight. The air almanac lists the local mean times of the beginning of morning civil twilight and the end of evening civil twilight in exactly the same format as sunrise and sunset tables. The twilight tables are printed on the right-hand pages facing the sunrise and sunset tables, with each pair covering the same block of calendar dates.
References in periodicals archive ?
The new 'Space Science in Action' collection from Schlessinger Media is a standards based, ten volume, DVD series specifically designed for students in grades 9 through 12 and which provides core astronomically themed science information combined with a 'hands-on', inquiry-based approach as evidenced through experiments and investigation.
CEO compensation has increased astronomically across the board, and despite the reluctance of the court system to interfere, critics have argued that it is obvious that new watchdogs are needed since shareholders and board members have been unable to restrain compensation growth.
Frank Jackson argued, in an astronomically frequently cited paper on 'Epiphenomenal qualia' [Jackson 1982] that materialism must be mistaken.
For 11 years, I had the chance to work with people I respected and certainly to make astronomically more money than I was making in theater or anywhere,'' he says.
Prices aren't as astronomically high for boutiques as one would think.
If smacking really is the best way to discipline a child and protect them from an adult life behind bars, then why is it that the UK - where smacking is still legal - has an astronomically high (and ever-increasing) crime rate, yet Sweden, where smacking children was completely outlawed in 1979, has an extremely low crime rate in comparison?
But while the industry is growing astronomically, financial professionals familiar with it say more efficiency and transparency are needed and would cause even more institutional investors to jump in.
Dershowitz' evidence coincides with Peters' evidence to such a degree of similitude that coincidental citation is astronomically unlikely.
With oil and natural gas prices at astronomically high levels and showing no signs of receding, the U.
Although I have 18 grandchildren, it's only small things I buy them at Christmas - on a pension I couldn't afford today's astronomically priced toys.
The Kennedy Information syndrome (sellers' expectations of astronomically high purchase price multiples) seemed finally to have worn off," Mark told us.