The first astronomer who did photometry in a systematic way (even though he did not have a telescope) was
A) Hipparchus
B) Ptolemy
C) Kepler
D) Galileo
E) Hubble

Question

Quizplus · Accepted Answer

Hipparchus was a Greek astronomer who lived in the second century BCE and was known for his extensive work on star cataloguing and brightness measurements. He used a system of six magnitude classes that is still in use today, with first magnitude stars being the brightest and sixth magnitude stars being the faintest visible with the naked eye. Even though he did not have a telescope, he developed a method of comparing stars of different brightness by eye, which is considered the first instance of photometry.

The First Astronomer Who Did Photometry in a Systematic Way