價格：免費
更新日期：2018-11-08
檔案大小：3.8M
目前版本：2.0
版本需求：Android 4.0.3 以上版本
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Local circumstances at greatest eclipse for every event during the century are presented in the following app. The calendar date and Universal Time of the instant of greatest eclipse are found in the first line. The eclipse type is given (T=Total, P=Partial, or N=Penumbral) along with the Saros series. Gamma is the distance of the Moon's center from the shadow axis of Earth at greatest eclipse (in Earth radii). The penumbral and umbral magnitudes of the eclipse are defined as the fractions of the Moon's diameter obscured by each shadow at greatest eclipse. The semi-durations of the partial and total phases of the eclipse are given to the nearest minute. Finally, the Greenwich Sidereal Time at 00:00 U.T., along with the Moon's Geocentric Right Ascension and Declination at greatest eclipse complete each record.
For any eclipse in the app, the start and end times of the partial eclipse phases can be calculated by respectively subtracting and adding the semi-duration of the partial phase (S.D. Par) to the instant of greatest eclipse. Similarly, the start and end times of the total eclipse can be calculated by either subtracting or adding the semi-duration of the total phase (S.D. Tot) to the instant of greatest eclipse.
To determine whether an eclipse is visible from a specific geographic location, it is simply a matter of calculating the Moon's altitude and azimuth during each phase of the eclipse. The calculations can be performed on any pocket calculator having trigonometric functions (SIN, COS, TAN). Armed with the latitude and longitude of the location, the lunar eclipse catalog provides all the additional information needed to make the calculations.
