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in accordance with the methods or principles of astronomy. -- As`tro*nom"ic*al*ly, adv. Astronomical clock. See under Clock. -- Astronomical day. See under Day. -- Astronomical fractions, Astronomical numbers. See under Sexagesimal.

Pertaining to gastromony.

celebrated work of Ptolemy of Alexandria, which contains nearly all that is known of the astronomical observations and theories of the ancients. The name was extended to other similar works.

A book or table, containing a calendar of days, and months, to which astronomical data and various statistics are often added, such as the times of the rising and setting of the sun and moon, eclipses, hours of full tide, stated festivals of churches, terms of courts, etc. Nautical almanac, an almanac, or year book, co…

Of or relating to Alphonso X., the Wise, King of Castile (1252- 1284). Alphonsine tables, astronomical tables prepared under the patronage of Alphonso the Wise. Whewell.

st point as indicated by the compass. The difference between the magnetic and the true or astronomical amplitude (see 3 above) is the "variation of the compass."

is made, having a movable horizon or cursor; -- formerly much used in solving some common astronomical problems.

An ancient astronomical instrument.

embling, a bracelet or ring; consisting of rings or circles. Armillary sphere, an ancient astronomical machine composed of an assemblage of rings, all circles of the same sphere, designed to represent the positions of the important circles of the celestial sphere. Nichol.

Astronomical.

Pertaining to the physics of astronomical science.

An old astronomical instrument, formed of two cones, on whose surface the constellations were delineated.

ird season of the year, or the season between summer and winter, often called "the fall." Astronomically, it begins in the northern temperate zone at the autumnal equinox, about September 23, and ends at the winter solstice, about December 23; but in popular language, autumn, in America, comprises September, October, a…

and usually beating half seconds; -- intended to keep time with great accuracy for use an astronomical observations, in determining longitude, etc.

arts of the instrument. Error of collimation, the deviation of the line collimation of an astronomical instrument from the position it ought to have with respect to the axis of motion of the instrument. -- Line of collimation, the axial line of the telescope of an astronomical or geodetic instrument, or the line which…

eld of view in a telescope, and moved by a screw with a graduated head, used for delicate astronomical observations; spider lines. Fixed cross wires are also used in microscopes, etc.

a period of 15 years, employed in Roman and ecclesiastical chronology, not founded on any astronomical period, but having reference to certain judicial acts which took place at stated epochs under the Greek emperors. -- Cycle of the moon, or Metonic cycle, a period of 19 years, after the lapse of which the new and ful…

marking divisions; graduating. Dividing engine, a machine for graduating circles (as for astronomical instruments) or bars (as for scales); also, for spacing off and cutting teeth in wheels. -- Dividing sinker. (Knitting Mach.). See under Sinker.

the Greater Dog, and the brightest star in the heavens; -- called also Canicula, and, in astronomical charts, a Canis Majoris. See Dog days.

globe, making an angle of 23º 28' with the equator; -- used for illustrating and solving astronomical problems.