Hello everyone, I am readying a book called “Astrophysics knowledge in a nutshell” by Sten Odenwald and I came across this equation and I cannot get the answers 30arc seconds (underlined in blue) can someone help me with the equation so that I can better understand thank you 😊

3yr ⋅ ⋅

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Hi, I am playing Sherlock Holmes consulting detective and I am unable to understand the journal’s curves fonts, can someone please help me with the fonts and tell me what they are written. Thank you

3yr ⋅

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