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[Spectroscopy has given us more information about stars than any other branch of Astronomy. Traditionally the domain of professional astronomers, it was an area of astronomy that very few amateurs would get involved in. Complicated texts and mathematics soon puts people off, and they lose...
[The Spectral sequence is a surface temperature sequence pioneered by Father Angelo Secchi in 1866 and developed at Marvard in the 1890’s by EC pickering, Williamina Fleming Antonia Maury and Annie Cannon resulting in the Famous seven letter sequence OBAFGKM. The Marvard-Drape system was further...
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