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e sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix.

A telescope of low power, having a large field of view, used for finding comets.

An instrument, intended to represent the revolution of a comet round the sun. Hutton.

Pertaining to, or resembling, a comet. Cheyne.

Matter; affair.

Relating to a comet.

One who describes or writes about comets.

A description of, or a treatise concerning, comets.

The department of astronomy relating to comets.

An instrument for measuring the amount of carbonic acid in a mixture.

Of or pertaining to an anthracometer.

An instrument for measuring the height of objects. Knight.

The art of measuring the distance of objects afar off. [Obs. or R.]

e November meteors (Andromedes or Bielids) move in its orbit, and may be fragments of the comet.

See Gleucometer.

An instrument for measuring the specific gravity and ascertaining the quantity of sugar contained in must.

An instrument for measuring the variations in size of the internal organs of the body, as the kidney, spleen, etc.

Same as Stethometer.

form of anathema. Maran atha is now considered as a separate sentence, meaning, "Our Lord cometh."

That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.