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Story Posted on May 16, 2021 Telescopes are the most recognizable tool in the astronomer’s toolkit, but equally important are the tools for recording astronomical data. In the 19th century, they included glass photographic plates, which captured snapshots of the night sky through the telescope, and notebooks for recording observations and measurements from the plates. The 24-inch Bruce Doublet telescope installed in Arequipa, Peru. (Courtesy of Harvard College Observatory)
Left: Glass plate photograph taken in Arequipa in 1925. (Courtesy of Harvard). Right: Cover of Annie Jump Cannon’s notebook featuring ‘Observations in Arequipa.’ (Courtesy of Harvard (Image ID: phaedra2228)) Beginning in 1885, the Harvard College Observatory (now part of the Harvard-Smithsonian Center for Astrophysics) began an ambitious project to survey the entire night sky. Astronomers at Harvard’s central observatory in Cambridge, Massachusetts, and its new obs ....
Mon May 10, 2021 ANNIE CANNON’S OBAFGKM 99 years ago, on May 9th, 1922, astronomers formally adopted Annie Jump Cannon’s stellar classification system. Annie Cannon worked at the Harvard Observatory, where she sorted and catalogued stars by their spectra. When you look at the light of a star through a specialized prism, a spectroscope, you can see that within the rainbow spectrum of the star’s light there are thin gaps where the color is missing. These gaps result when the outer atmospheres of those stars absorb the light, and the spacing of the gaps can be matched up with similar lines made by gases on earth, which tells us what elements are present in those far-away stars – kind of a cosmic bar code. Cannon sorted the stars, and after some adjustments that had to be made because of things like high temperature ionization, resulted in a ranking of stars from hot to cool: O, B, A, F, G, K and M, which countless astronomy students have memorized by using this simple phr ....
US Naval Academy during civil war. (Image Source: Pinterest) When Annapolis Moved to Newport, RI. The United States Naval Academy is and was located in Annapolis, Md., and that posed a problem with the advent of the Civil War in 1861. Maryland, a border state with many Southern sympathizers, was plausibly within striking distance of Confederate forces. 1874 The first horse-drawn bus makes its début in the city of Mumbai, plying two routes Tram service in Mumbai. (Image Source: MeMumbai) On this day in History, the first horse-drawn tram made its début in the city, plying on the Colaba–Pydhone via Crawford Market, and Bori Bunder to Pydhonie via Kalbadevi routes. The initial fare was three annas (15 paise), and no tickets were issued. ....
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