BT Monocerotis was a nova, which lit up in the constellation Monoceros in 1939. BT Monocerotis reached a brightness of 4.5 mag. Its brightness decreased after the outbreak in 36 days by 3 mag. This article needs to be cleaned up to conform to a higher standard of quality. ... Monoceros (Latin for Unicorn) is a faint constellation on the winter night sky, surrounded by Orion to the west, Gemini to the north, Canis Major to the south and Hydra to the east. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ...
Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ...
BT also offers an international direct-dialled telephone service to more than 200 countries and other overseas territories – covering 99% of the world's 800 million telephones.
BT formed part of the Post Office until 1980, and was privatized in 1984.
BT is the second-largest shareholder in INTELSAT and operates satellite stations at London Docklands, Goonhilly Downs, Cornwall, in Hereford, and at Aberdeen.
The 80mm BT is a doublet while the Obie 100mm is a triplet and much heavier at around 26 pounds, with a total rig weight of over 40 pounds.
However, the 80mm BT can be moved around my back yard with ease, and I keep it fully set up in my living room so that no assembly/disassembly is required.
The only real downside with this BT that I have encountered is that sometimes it is not easy changing eyepieces due to the overly snug fit – it sometimes takes some muscle to extract eyepieces, and this results in the image moving out of the eyepiece field.
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