'To measure how far away a star is using this, take 2 measurements, 6 months apart'
parallax
PAR FOR THE...: To measure how far away a star is using this, take 2 measurements, 6 months apart
To measure how far away a star is using this, take 2 measurements, 6 months apart
To measure how far away a star is using this, take 2 measurements, 6 months apart
"PAR" FOR THE...
parallax
"PAR" FOR THE...