September 1, 2021
The phase of the Moon is waning
crescent today.
September 2, 2021
The phase of the Moon is waning
crescent today.
September 3, 2021
The phase of the Moon is waning
crescent today.
That bright red star that you see
one third of the way up in the west at
9:30 PM is Arcturus, a Red Giant in the
constellation of Boötes.
September 5, 2021
September 6, 2021
The phase of the Moon is waning
crescent today.
September 7, 2021
The Moon is New at 00:51 U.T.
today. That is actually 8:51 PM on the
evening of the 6th in the Eastern Time
Zone of the United States.
This is the birthday of the late
James Van Allen, who discovered the
zones of radiation surrounding the
Earth.
September 8, 2021
The phase of the Moon is waxing
crescent today
The bright red star you see about
one third of the way up in the west at
sunset is called Arcturus, the brightest
star of the constellation Boötes. It's a
relatively nearby Red Giant star.
September 9, 2021
Welcome to Planetary Astronomy
for the Fall Semester of 2021.
The phase of the Moon is waxing
crescent today.
Forty-six years ago today, the
Viking 2 spacecraft was launched on a
mission to Mars with the goal to land
on the surface of the Red Planet in a
region called Utopia.
September 10, 2021
September 11, 2021
The phase of the Moon is waxing
crescent today.
Look very low in the south after
sunset to see the red giant star called
Antares.
September 12, 2021
September 13, 2021
The Moon is at first quarter
phase at 20:39 U.T. today.
Look for the Great Square of
Pegusus in the east tonight at about
10 PM. However, if you do not have a
dark sky, you will just be able to see
the four stars of the square.
Click on the image to the left for
a preview.
September 14, 2021
The Moon is a waxing gibbous
today.
September 15, 2021
The phase of the Moon is waxing
gibbous today.
Have you seen the ‘W’ shape of
the constellation Cassiopeia in the
northeast after sunset? Click on the
image to the left for help finding this
shape.
September 17, 2021
The phase of the Moon is waxing
gibbous today.
In the east after sunset, You’ll see
the constellation of Andromeda , home
to the famous M31 spiral galaxy, the
closest spiral galaxy to our own Milky
Way.
September 18, 2021
The phase of the Moon is waxing
gibbous today.
Vega is nearly overhead for most
Americans at sunset; a blue-white star
which is about 27 light years away
from Earth. It is the fifth brightest star
in the sky and should be visible even
for observers at the center of the
brightest city.
September 20, 2021
The Moon is Full at 23:54 U.T.
today.
The Full Moon of September is the
Back to School Moon.
This is the Harvest Moon for
2021. The Harvest Moon is
traditionally the Full Moon closest to
the date of the autumnal equinox. The
autumn equinox is two days from now.
September 21, 2021
The phase of the Moon is waning
gibbous today.
September 22, 2021
The phase of the Moon is waning
gibbous today.
This is the date of the autumnal
equinox for 2021, the first day of
autumn in the northern hemisphere. At
11:20 U.T. the Sun crosses the celestial
equator. There will be nearly the same
number of hours of daylight and
darkness. See the link above for the
technical explanation.
September 23, 2021
The phase of the Moon is waning
gibbous today.
September 24, 2021
The phase of the Moon is waning
gibbous today.
September 25, 2021
The phase of the Moon is waning
gibbous today.
September 26, 2021
The phase of the Moon is waning
gibbous today.
September 27, 2021
The phase of the Moon is waning
gibbous today.
September 28, 2021
The phase of the Moon is waning
gibbous today.
September 30, 2021
The phase of the Moon is waning
crescent today.
