The sumner line of position : furnished ready to lay down upon the chart by means of tables of simultaneous hour angle and azimuth of celestial bodies
著者
書誌事項
The sumner line of position : furnished ready to lay down upon the chart by means of tables of simultaneous hour angle and azimuth of celestial bodies
（H.O. pub., n. 203）
the Hydrographic Office under the authority of the Secretary of the Navy, 1923
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注記
Latitude 60°N. to 60°S. - Declination 27°N. to 27°S