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We will answer a viewer's question of “How do we measure distance to stars?” However that question will be answered over the course of 7 videos. The 2nd of 7 video will show that once we know what kind of stars we have then we compare the stars to the B-V color index (i.e. Rigel B-V=-0.03, Sun B-V=0.656, and Sirius B-V=0.00 and U-B=-0.05) and see where is falls on the Color Index Table.

Next video in this series can be seen at:
https://youtu.be/gC2D5oX7uYc