单词	abac scale
释义	ABAC scale ABAC scale A nomogram for obtaining the conversion angle to apply when plotting great circle bearings on a mercator projection. ABAC scale ABAC scale A nomogram for determining the conversion angle to apply when plotting great-circle bearings on a Mercator projection. ABAC scales are printed on the margins of Mercator plotting charts. Scales A and C are interrelated, as are B and D. In the illustration, the ABAC scale measures the conversion angle for two places that have a 16° change of longitude between them and a mean latitude of 50°. The conversion angle in this case is 6°.
随便看	e3v e4 e-400 e400 e401 e401k e402 e405 e406 e407 e413 e414 e415 e420 e421 e422 e425 e440 e441 e450 e452 e459 e460 e461 e466

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