No constellation could be said to be the first. People have identified constellations since pre-historic times, so there is no record of who decided on them and which they decided on first.
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The brightest star in a constellation is known as the alpha star. It is typically designated as the first letter of the Greek alphabet followed by the genitive form of the constellation name. For example, Alpha Centauri is the brightest star in the Centaurus constellation.
Orion is not a star, it is a constellation. Being a constellation, it has many stars in it. It has been a recognised constellation since humans first looked at the night sky, thousands of years ago.
The constellation Leo is named after the Latin word for lion. Its depiction as a lion in the sky dates back to ancient civilizations such as the Babylonians and Greeks.
Yes. Alpha, The first letter of the Greek Alphabet, means it is the brightest star in the constellation. Bootes identifies the Constellation. A few very bright stars have a single name.
There is no such thing as "the Orion star". Orion is a constellation - which is basically a general direction in the sky, and there are many, many stars in that constellation.