Please click here for information about the calendars.

September 21, 2015 - In the Shadow of Earth

In the Shadow of Earth  Observers in the Americas, Europe, and Africa will see a total lunar eclipse Sunday night. Beginning 9:07 PM ET, the Moon will enter the umbra, or darkest part, of Earth’s shadow and will be completely eclipsed by 10:11 PM ET. At the distance of the Moon, the Earth casts a shadow that is about 9,000 km wide (5,550 mi), two-and-a-half times the diameter of the Moon. The Moon won’t pass through the widest part of the shadow, but it will still be completely eclipsed for just over an hour. During this time, the Moon will take on a dark, ruddy hue caused by sunlight being refracted through Earth’s atmosphere. This composite image by Jay GaBany shows the eclipse of April 15, 2014. Jay imaged the Moon, then a few nights later revisited the same spot of the sky to capture the star field.

Image credit: R. Jay GaBany / Cosmotography.com

Weekly Calendar

September 21-27, 2015

Holidays - Sky Events - Space History


Moon phase Monday 21

Venus at greatest illuminated extent
First Qtr Moon 4:59 AM ET

1866: H. G. Wells born
: Gustav Holst born
1974: Mariner 10 flies by Mercury for second time
2003: Galileo mission ends

Moon phase Tuesday 22

Yom Kippur begins at sunset

1990: Pioneer 10 reaches 50 AU from Sun
2006: Hinode spacecraft launched
2014: MAVEN spacecraft enters orbit around Mars

Moon phase Wednesday 23

Equinox 4:21 AM ET

1783: Caroline Herschel discovers NGC 253
1846: J. G. Galle discovers Neptune
1962: “The Jetsons” premieres
1977: Third glide test of space shuttle Enterprise

Moon phase Thursday 24

Mars 0.8° north of Regulus
Pluto appears stationary

1930: John Young born
1962: MOOSE astronaut rescue system proposed
1970: Luna 16 returns lunar soil samples
1999: IKONOS-1 launched
2014: Mars Orbiter Mission enters orbit around Mars

Moon phase Friday 25

1973: 59-day Skylab 3 mission ends
1992: Mars Observer launched
1997: STS-86 Atlantis launched
2008: Shenzhou 7 launched
2013Soyuz TMA-10M launched carrying ISS Expedition 37/38 crew
2014Soyuz TMA-14M launched carrying ISS Expedition 41/42 crew

Moon phase Saturday 26

Neptune 3° south of Moon

Moon phase Sunday 27

Moon at perigee
Full Moon 10:50 PM ET
Total lunar eclipse (Americas, Europe)

1814: Daniel Kirkwood born
2007: Dawn spacecraft launched

Suggestions for new history dates or better links? Corrections for errors on this page? Please e-mail me.