Instantaneous Local Circumstances of Solar and Lunar Eclipses
US Naval Observatory Washington United States
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The instantaneous local circumstances of an eclipse answer the question Given a specific time and a location on or near the surface of the Earth, is a lunar or solar eclipse in progress, and if so, what are the eclipse conditions i.e., magnitude or obscuration at that time and location The answer to this question is especially important for planning activities or operations in which illumination is critical. Eclipses can have a profound impact on the level of natural light, yet are often overlooked when predicting the illuminance. This technical note describes how to compute the instantaneous local circumstances of solar and lunar eclipses.
- Celestial Mechanics