The change produced in the right ascension or declination of a star by the precession of the equinoxes and proper motion of the star taken together. Also, the annual variation of the compass.
·noun Change of termination of words, as in declension, conjugation, derivation, ·etc. II. Variatio...
Webster's Dictionary of the English Language
A term applied to the deviation of the magnetic needle or compass, from the true north point towards...
The Sailor's Word-Book
·noun Anything, especially a plant, that lasts but one year or season; an annual plant. II. Annual ...
Those astronomical motions which return or terminate every year. ...
Is the change in the declination of the needle observed at different times in the same place. ...
The well-known chart produced by Halley, whereon a number of curved lines show the variation of the ...
The ship's books and papers for the year. ...
An inequality in the moon's march, arising from the eccentricity of the earth's orbit, whereby the d...
See parallax. ...
In addition to the general accounts of the year, there are three returns to be transmitted to the ad...
See annual equation. ...
An inequality in the movement of our satellite, amounting at certain times to 37′ in longitude: it w...