was related to the star's magnitude, not distance. Yet magnitude itself allowed you to calculate distance. Leavitt published her findings in 1912 -- in a chart of 25 cepheid periods and their ...

To find this object, look 3° east-northeast of magnitude 5.3 Mu (μ) Canis Majoris. A 6-inch telescope at 150x will reveal 30 stars splayed unevenly across a field of view 12′ in diameter.