Annotations of elementary astronomical observation


Posts Tagged ‘Moon

Sinus Iridum and the Moon Maiden

Posted by: bitacoradegalileo on: July 27, 2011

Sinus Iridum is a representative bay on the visible side of the moon, on the northwestern edge of Mare Imbrium (the Sea of ​​Rains), whose location we pointed out in the photograph on the left, marked in red. This is a vast mare, the second largest in the Moon, only surpassed in diameter by Mare […]


The Pleiades open cluster

Posted by: bitacoradegalileo on: July 21, 2011

WHAT ARE OPEN CLUSTERS? Open clusters are groups of tens, hundreds or thousands of stars originated in the same cloud of gas. Often the gas is gone, in whole or in part, because the radiation emitted by the brightest stars and his appearance is that of an irregular splash of bright spots, with no general structure and asymmetric. The hosted stars are generally young (a few hundred million years; compare with the 4,000 million of the Sun), massive and very hot. They are scattered on sizes in the order of thirty light-years, and are slowly dispersed by the tidal […]


Posted by: admin on: July 16, 2011

Today we write an explanation of the meaning of “lunar terminator”. I searched the internet and not fully satisfied me anything I found. So I accepted the challenge to explain it myself, with some graphic support, to help understand it better. It is well known that the moon, the beautiful heavenly body that serves us as companion day and night, though […]