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Ephemeris: 04/22/2025 – Earth Day
This is Ephemeris for Earth Day, Tuesday, April 22nd. Today the Sun will be up for 13 hours and 50 minutes, setting at 8:37, and it will rise tomorrow at 6:44. The Moon, 2 days past last quarter, will rise at 4:48 tomorrow morning.
Earth Day was established in 1970, 2 years after William Anders in Apollo 8 took a picture of the Earth rising over the desolate moon, the Earth, a blue white oasis, in a hostile universe. I say support your local planet, there is no Planet B in case you messed this one up. Elon Musk wants to make the human race multi-planetary, which is a fine idea over time. It may take over a century to make any kind of Mars Base self-sustaining, if ever. I can’t see how we can terraform Mars, that is make Mars earth-like, because of lack of material. Mars was more earth-like in its first billion years, but it has no magnetic field. Any large atmosphere it had when it had oceans has long been stripped away by the solar wind.
The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT – 4 hours). Times will be different for other locations.
Addendum
Look again at that dot. That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam.
― Carl Sagan, Pale Blue Dot: A Vision of the Human Future in Space
The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot.
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we’ve ever known.
Bob Moler's Ephemeris Blog 