When the moon eclipses the sun what direction is darkened first: left or right?
I saw the question and answer for the explanation of the direction of the moon's eclipse from left to right, but what about the direction of the moon as it passes over or between Earth and the sun?
Does the moon always pass from the right to the left or from the left to the right as it covers the sun; if you live above the equator?
Or does this change? Can it change? August 2017 the USA will have a total eclipse of the sun for the first time in decades.
Relative to the Sun, stars, and Earth's shadow, the Moon always appears to move from west to east.
How this looks relative to the horizon depends on your latitude and time of day.
If a solar eclipse occurs in the middle of the day, the Moon appears to move from right to left if you're in a northern latitude, or from left to right if you're in a southern latitude.
If you're in a tropical latitude, the Moon appears to move downward if the eclipse occurs in the morning or upward if in the afternoon.
Coincidentally, Randall Monroe posted a drawing covering exactly this issue (with, of course, a few humorous states thrown in).
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