earth convergence

i. The angle that one meridian on the earth's surface makes with another. See convergency (i).
ii. The angle between two meridians at a given latitude. At the poles, its value is the change of longitude, but it slowly reduces toward the equator when the value is zero, as meridians become parallel to one another. Earth's convergence is the change of longitude multiplied by the sine of the latitude. See convergency (ii).
iii. The difference between the great-circle bearing of two meridians. It is equal to the change of longitude (ch long) λ sine latitude. See convergency (iii).
iv. Also called convergency.

单词	earth convergence
释义	DictionarySeeconvergency earth convergence earth convergence i. The angle that one meridian on the earth's surface makes with another. See convergency (i). ii. The angle between two meridians at a given latitude. At the poles, its value is the change of longitude, but it slowly reduces toward the equator when the value is zero, as meridians become parallel to one another. Earth's convergence is the change of longitude multiplied by the sine of the latitude. See convergency (ii). iii. The difference between the great-circle bearing of two meridians. It is equal to the change of longitude (ch long) λ sine latitude. See convergency (iii). iv. Also called convergency.
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