• Star magnitude .
• + 12 stellar magnitude .
• Third magnitude stars are readily visible to the unaided eye.
• Star magnitude .
• + 12 stellar magnitude .
• Third magnitude stars are readily visible to the unaided eye.
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012