ptolemy
Do Stars Move? Tracking Their Movements Across the Sky
The stars look static in the sky, but are they moving? How fast, and how do we know? What events…
The Cepheus Constellation
Located in the northern hemisphere is Cepheus, one of the 48 constellations included by Ptolemy in his classic work, The…
The Cassiopeia Constellation
In the northern skies (recognizable from its W shape) is the familiar constellation of Cassiopeia, one of the 48 traditional…
The Canis Minor Constellation
Located in the northern skies, surrounded by the Monoceros, Gemini, Cancer and Hydra, is the constellation known as Canis Minor.
The Constellation Boötes
In the northern skies, flanked by the Big Dipper, lies the Bootes constellation, one of the traditional constellations listed by…
The Constellation Auriga
In the northern skies lies the constellation Auriga, one of the 44 described by Ptolemy and one of the 88…
The Constellation Aries
On the ecliptic plane, bordered by constellations of Perseus, Pisces, and Taurus, is the ancient constellation known as Aries
The Aquarius Constellation
Aquarius ("The Water Carrier") stretches from the celestial equator to the southern hemisphere, and is one of the most-recognized of…
What Is The Geocentric Model Of The Universe?
The geocentric model of the universe, in which the Sun, planets and stars revolved around the Earth, was the accepted…
What Is The Heliocentric Model Of The Universe?
In 1543, Polish astronomer Nicolaus Copernicus revolutionized astronomy by proposing his heliocentric model of the Universe