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Posts Tagged ‘Earth Day’

04/22/2021 – Ephemeris – Earth Day

April 22, 2021 Comments off

This is Bob Moler with Ephemeris for Earth Day, Thursday, 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 first quarter, will set at 5:24 tomorrow morning.

The Earth is unique in the solar system. Actually every planet is unique, as we’ve found out with our spacecraft that have at least flown by every planet of the solar system, plus the dwarf planets Pluto and Ceres. But the Earth uniquely supports life as we know it. It’s the only one that we know of. It is imperative that we colonize the Moon, Mars and asteroids and live off the land, so no single disaster can wipe the human race out. However, we need to take care of the Earth, to understand and get a grip on what we’re doing to Earth’s climate. We must think of the Earth as a spaceship with both renewable resources and limited ones. Our journey is long, and the supplies will have to last. So support your local planet!

The astronomical event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

The Earth from the DSCOVR satellite orbiting the Sun-Earth L1 point The image was taken two days ago. Credit NOAA.
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04/22/2019 – Ephemeris – Earth Day

April 22, 2019 Comments off

Ephemeris for Earth Day, Monday, April 22nd. Today the Sun will be up for 13 hours and 49 minutes, setting at 8:36, and it will rise tomorrow at 6:45. The Moon, 3 days past full, will rise at 12:24 tomorrow morning.

A good slogan for this Earth Day or any day is “Support your local planet.” As an amateur astronomer I look around the solar system at all the habitable planets. The Earth is it. Mars may be terraformed at great expense, that is made more earth-like. There may be life in the oceans of Jupiter’s moon Europa, or Saturn’s Enceladus, but they are not habitable for us. Terraforming (stopping and reversing climate change)  the Earth would be the easiest and much more practical. One look at our nearest neighbor Venus will show us our fate, hopefully in billions of years from now, a hell hole of heat and a crushing atmosphere. Our job is push-off that day as far as we can, and keep the Earth a blue-green oasis in the solar system.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Earthrise

Earth rising above the Moon’s limb from Apollo 8. Credit: NASA/Apollo 8

Mars

Mars had its day, but that ended about 3 billion years ago. Being half the size of the Earth, Mars cooled down, lost its magnetic field, so the solar wind stripped away most of its atmosphere and water. Credit NASA.

Europa

Europa, one of the four Galilean moons of Jupiter and easily seen in small telescopes, is slightly smaller than our Moon. Under that thick icy shell lurks an ocean with more water than all the Earth’s oceans. There’s probably volcanic vents like the black smokers in Earth’s oceans where a whole ecology of extremophiles could live like they do on Earth. Credit: NASA.

Enceladus, a small moon of Saturn spews continuous geysers of water from cracks in its south polar region indicating an ocean below its frozen icy exterior. Sampling the plumes with the right instruments may detect life on this small world without the need for drilling. Credit: NASA.

Venus

Is this our future? Venus had the misfortune of ending up too close to the Sun. It has a hellish landscape of nearly 900 degrees F, and 90 times the Earth’s atmospheric pressure. Its clouds consist of sulfuric acid. Talk about a runaway greenhouse effect and acid rain… Credit: NASA.

04/22/2013 – Ephemeris – Spaceship Earth

April 22, 2013 Comments off

Ephemeris for Earth Day, Monday, April 22nd.  The sun rises at 6:46.  It’ll be up for 13 hours and 50 minutes, setting at 8:36.   The moon, 3 days before full, will set at 5:17 tomorrow morning.

The earth is unique in the solar system.  Actually every planet is unique, as we’ve found out with our spacecraft that have at least flown by every planet of the solar system, and we’re two years from flying by the dwarf planet Pluto and its so far discovered 5 moons.  But the earth uniquely supports life as we know it.  It is the only one.  While it is imperative that we colonize the moon, Mars and asteroids and live off the land so no single disaster can wipe us out, we need to take care of the earth, to understand and get a grip on what we’re doing to earth’s climate.  We must think of the earth as a spaceship with both renewable resources and limited ones.  Our journey is long, the supplies will have to last.

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.

Addendum

Our home

Our home. Credit NASA.