Source: wikibot/john-e-bortle
= John E. Bortle
{wiki=John_E._Bortle}
John E. Bortle is an American amateur astronomer well-known for his contributions to the field of astronomy, particularly in areas related to variable stars and observational astronomy. One of his notable contributions is the "Bortle Dark-Sky Scale," which he developed to classify the night sky's brightness and the quality of astronomical observing conditions.