lunar distance

The older method, called "lunar distances", was refined in the 18th century.

However, they remained very expensive and the lunar distance method continued to be used for some decades.

A lunar distance changes with time at a rate of roughly half a degree, or 30 arc-minutes, in an hour.

His observations did contribute to the lunar distance method.

This became known as the lunar distance method.

Mostly the same vehicle, it lacked the larger antenna needed to communicate at lunar distance.

The almanac gives lunar distances as they would appear if the observer were at the center of a transparent Earth.

Lunar distance (navigation), a measurement used in the calculation of longitude.

The navigator then consults a prepared table of lunar distances and the times at which they will occur.

The first correction to the lunar distance is the distance between the limb of the Moon and its center.

The sextant was derived from the octant in 1757 to provide for the lunar distance method.

Copernicus later used this observation to disprove Ptolemy's model of lunar distance.

Having measured the lunar distance and the heights of the two bodies, the navigator can find Greenwich time in three steps.

The lunar distance method was used by mariners either in conjunction with or instead of the marine chronometer.

Lunar distance (astronomy), the distance between the Earth and the Moon.

In celestial navigation, lunar distance is the angle between the Moon and another celestial body.

This gives a ratio of solar to lunar distance of approximately 19, matching Aristarchus's figure.

Mendoza's lunar tables have been used through almost the entire nineteenth century (see Lunar distance (navigation)).

Clearing the lunar distance means correcting for the effects of parallax and atmospheric refraction on the observation.

Its orbit is distinctly elliptic, so the lunar distance from Earth varies throughout the lunar cycle.

By comparing the corrected lunar distance with the tabulated values, the navigator finds the Greenwich time for that observation.

The lunar distance method was initially labour intensive because of the time-consuming complexity of the calculations for the Moon's position.

His method was a variation of the lunar distance method first put forward by Johann Werner in 1514.

Lunar distances continued to be published in the UK official almanacs until 1906, by which time their use had declined in practice.

Lunar distance may refer to: