September 2021 Space Calendar: Keep track of what’s going on in space this month, September 2021.
- September 2021 Space Calendar: These dates are subject to change. Space.com provided the launch dates.
- Mercury reaches its greatest peak in the evening sky on September 3. The innermost planet, with a magnitude of 0.1, will be barely visible above the western horizon around sunset.
- The new moon occurs at 8:52 p.m. EDT on September 6. (0052 September 7 GMT).
- The moon and Venus will be conjunct on September 9th. The waxing crescent moon will pass around 4 degrees north of Venus. After sunset, look for the duo over the western horizon.
- September 13: Mercury is at its maximum eastward elongation. The innermost planet will shine brilliantly at magnitude 0.1 when it reaches its maximum eastern separation from the sun. Observe the elusive planet as it rises over the western horizon just after sunset.
- Neptune is in opposition on September 14th. The gas giant will be at its brightest and largest of the year, with a magnitude of 7.8. (To view it, you’ll need a telescope.)
- On September 15, SpaceX will launch Inspiration4, the first all-civilian orbital mission, using a Falcon 9 rocket and Crew Dragon spacecraft. It will take off from NASA’s Kennedy Space Center in Florida’s Launch Complex 39A. Keep an eye on it live.
- The NASA/USGS Landsat 9 satellite will be launched from Vandenberg Space Force Base in California on September 16 by a United Launch Alliance Atlas V rocket. The moon and Saturn will be conjunct on September 16th. In the evening sky, the waxing gibbous moon will be around 3 degrees south of Saturn.
- The moon and Jupiter will be conjunct on September 18. In the evening sky, the waxing gibbous moon will be around 4 degrees south of Jupiter.
- September 20: The Full Harvest Moon, also known as the September Full Moon, occurs at 7:55 p.m. EDT (2355 GMT).
- September 22: The equinox occurs at 3:21 p.m. EDT (1921 GMT), signalling the beginning of fall in the Northern Hemisphere and the beginning of spring in the Southern Hemisphere.
- On September 24, the waning gibbous moon and Uranus will pass within 1.3 degrees of each other. Uranus, with a magnitude of 5.7, may be seen to the naked eye in dark conditions.
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