Simoon to Solstices

A hot, dry wind blowing from a desert.

A perpendicular line form one extremity of an arc to the diameter drawn through the other extremity.

Artificial Sines. Logarithms of the sines.

Line of Sines. A divided line on Gunter's scale.

The sine of the arc which measures the angle.

The sine of the angle of incidence.

The sine of the angle of reflection.

The sine of the angle of refraction.

The cosine.

Versed Sine. Distance from the foot of the sine of an arc to the extremity of the arc, the distance being measured on the radius passing through that extremity.

One observation of a heavenly body; one angular measurement.

The movable limb on an instrument of reflection, having the mirror or index glass on one end and the vernier on the other.

The difference between the distance run by a steaming vessel and the distance that would have been covered had the propeller acted upon a solid substance, instead of a fluid; in other words, the expression slip of wheel may be understood as the lost motion of the propeller. It is usual to allow a certain number of revolutions of the propeller or paddles to the mile, and at the end of a stated time the estimated distance run by the ship, according to the number of turns made, is compared with the distance run according to observation, or by the log, and the difference is expressed as a per centum, and entered in the log book as slip of wheel. The retardation by reason of head winds, opposing currents, and head seas are counted as slip.

Pertaining to the sun.

The interval of time between tow successive transits of the sun over the same meridian.

The sun and the various bodies that revolve round it.

Time measured by the sun. (See Time.)

The period in which the sun moves form the vernal equinox to the vernal equinox again.

The time of the year (June 21 and December 21) at which the sun is at his greatest distance from the equator, north and south respectively. The turning points in the sun's declination, known as the summer and winter solstices, according to the hemisphere of the observer.