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Sunday, 1 August 2021

Saturday, 31 July 2021

White-eyed river martin

  July 31, 2021      No comments   Edit
White-eyed river martin.
The white-eyed river martin (Pseudochelidon sirintarae) is a passerine bird in the swallow family. First found in 1968, it is known only from a single wintering site in Thailand, and may be extinct, since there have been no confirmed sightings since 1980 despite targeted surveys in Thailand and Cambodia. The adult has mainly glossy greenish-black plumage, a white rump, and a tail with two long central feathers that widen to a racket-shaped tip. It has a white eye ring and a broad, bright greenish-yellow bill. The juvenile lacks the tail ornaments and is browner. Like other swallows, it feeds on insects caught in flight, and its wide bill suggests that it may take relatively large species. It roosts in reed beds in winter, and may nest in river sandbanks. Its apparent demise may have been hastened by trapping, loss of habitat and dam construction. The martin is one of only two birds endemic to Thailand. The country's government has featured the bird on a stamp and a commemorative coin. (This article is part of a featured topic: River martin.)

Friday, 30 July 2021

Apollo 15

  July 30, 2021      No comments   Edit
Apollo 15.
Apollo 15 (July 26 – August 7, 1971) was the fourth crewed mission to land on the Moon. It was the first J mission, with a longer stay on the Moon (July 30 – August 2) and a greater focus on science, including the first Lunar Roving Vehicle. David Scott and James Irwin landed near Hadley Rille and spent 18+1⁄2 hours on extravehicular activity, collecting 170 pounds (77 kg) of surface material. At the same time, Alfred Worden orbited the Moon, operating the sensors in the SIM bay of the service module. During the return trip, Worden performed the first spacewalk in deep space. The Apollo 15 mission splashed down safely, with all goals accomplished, but was marred when it emerged that the crew had carried unauthorized postal covers to the lunar surface, some of which were sold by a West German stamp dealer. The crew was reprimanded for poor judgment, and did not fly in space again. The mission also saw the collection of the Genesis Rock, thought to be part of the Moon's early crust, and Scott used a hammer and a feather to demonstrate Galileo's theory that absent air resistance, objects fall at the same rate regardless of mass.

Thursday, 29 July 2021

Andreas Palaiologos

  July 29, 2021      No comments   Edit
Andreas Palaiologos.
Andreas Palaiologos (1453–1502) was the elder son of Thomas Palaiologos, Despot of the Morea, and a nephew of Constantine XI Palaiologos, the final Byzantine emperor. After the fall of Constantinople in 1453 and the Ottoman invasion of the Morea in 1460, Andreas's father fled to Corfu with his family. Upon his father's death in 1465, Andreas moved to Rome and was recognized as the titular Despot of the Morea and as the chief claimant to the ancient imperial throne. Although his father had never claimed the title, Andreas proclaimed himself "Emperor of Constantinople" from 1483 onwards, a claim that was supported by some of the Byzantine refugees who lived in Italy. Andreas traveled around Europe in search of a ruler who could aid him in retaking Constantinople, but rallied little support. In 1481 an expedition he started organizing to restore the Byzantine Empire was canceled. He died in poverty in Rome in 1502 and was buried in St. Peter's Basilica.
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