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| | ESA - Science - Home - 11 December |
 | | She reorganised the classification of stars in terms of surface temperature in spectral classes O, B, A, F, G, K, M and catalogued over 225 000 stars for the Henry Draper Catalogue of stellar spectra. |
 | | Titius was a Prussian astronomer whose formula showing the distances between the planets and the Sun was confirmed by Bode in 1772, when it was called Bode's Law (now the Titius-Bode Law). |
 | | Titius suggested that the mean distances of the planets from the Sun very nearly fit a simple relationship of A=4+(3x2n) giving the series 4, 7, 10, 16, 28, 52, 100, corresponding to the relative distance of the six known planets, up to Saturn, and a 'missing' value of 28 between Mars and Jupiter. |
| www.esa.int /esaSC/SEMA2BXLDMD_index_2.html (266 words) |
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