John Logie Baird gave the first demonstration of a colour television transmission on July 3rd, 1928. The leading pioneer in the creation of television, John Logie Baird, was a Scotsman, born in 1888, the son of a Presbyterian minister, and educated in Glasgow. An electrical engineer and an eccentric genius, he was no businessman, his health was precarious and after a time spent marketing socks, jam and soap he suffered a nervous breakdown.
A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth (1â60) of one degree. As one degree is 1â360 of a circle, one minute of arc is 1â21600 of a circle (or, in radians, Ïâ10800). It is used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying and marksmanship.
Longitude at a point may be determined by calculating the time difference between that at its location and Coordinated Universal Time (UTC). Since there are 24 hours in a day and 360 degrees in a circle, the sun moves across the sky at a rate of 15 degrees per hour (360Â°/24 hours = 15Â° per hour). So if the time zone a person is in is three hours ahead of UTC then that person is near 45Â° longitude (3 hours Ã 15Â° per hour = 45Â°).