54. Ephemeris (astronomy), noun. From Greek ephemeris, “diary, calendar,” from ephemeros, “lasting only one day, short-lived.” A table or data file showing the expected position of a celestial body—such as an asteroid, planet, satellite, comet, or star—as it will be seen from a particular place on Earth at a particular time. Astronomers have been developing ephemerides for millennia; modern versions are usually generated automatically by scientific software and displayed in equatorial coordinates. You can look up where the moon will hang on this night in a hundred years, and find a value that’s as near as matters, for the ordinary eye; but you can’t tell how you’ll feel tomorrow morning. Perturbations, perturbations.

Feb 23 -

54. Ephemeris (astronomy), noun. From Greek ephemeris, “diary, calendar,” from ephemeros, “lasting only one day, short-lived.” A table or data file showing the expected position of a celestial body—such as an asteroid, planet, satellite, comet, or star—as it will be seen from a particular place on Earth at a particular time. Astronomers have been developing ephemerides for millennia; modern versions are usually generated automatically by scientific software and displayed in equatorial coordinates.


You can look up where the moon will hang on this night in a hundred years, and find a value that’s as near as matters, for the ordinary eye; but you can’t tell how you’ll feel tomorrow morning. Perturbations, perturbations.

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