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due to a family emergency I will be scheduling the normal posts for tomorrow.

I will be unavailable except for text messaging. thank you

IOTD *special*

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Star of Bethlehem

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Calendar day; June 30, 2015

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Tuesday, the 30th of June, 2015is the 181th day in 2015 and in the 27th calendar week.
General Events:
Leap Second Time Adjustment Day
June 30, 2015 in the World
A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1. Without such a correction, time reckoned by Earth’s rotation drifts away from atomic time because of irregularities in the Earth’s rate of rotation. Since this system of correction was implemented in 1972, 25 such leap seconds have been inserted. The most recent one happened on June 30, 2012 at 23:59:60 UTC. A leap second, the 26th, will again be inserted at the end of June 30, 2015 at 23:59:60 UTC.
The UTC time standard, which is widely used for international timekeeping and as the reference for civil time in most countries, uses the international system (SI) definition of the second, based on atomic clocks. Like most time standards, UTC defines a grouping of seconds into minutes, hours, days, months, and years. However, the duration of one mean solar day is slightly longer than 24 hours (86400 SI seconds). Therefore, if the UTC day were defined as precisely 86400 SI seconds, the UTC time-of-day would slowly drift apart from that of solar-based standards, such as Greenwich Mean Time (GMT) and its successor UT1. The purpose of a leap second is to compensate for this drift, by occasionally scheduling some UTC days with 86401 or 86399 SI seconds.
Where is the event?
Worldwide
Meteor Day 2015
June 30, 2015 in the World
Meteor Day is celebrated on June 30, 2015. It commemorates the Tunguska event in 1908. The Tunguska event was an enormously powerful explosion that occurred near the Podkamennaya Tunguska River at about 00:14 UT on June 30. The explosion is believed to have been caused by the air burst of a small asteroid or comet at an altitude of 5–10 kilometres (3–6 mi) above the Earth’s surface. Different studies have yielded widely varying estimates of the object’s size, on the order of 100 metres (330 ft). It is the largest impact event on or near Earth in recorded history.
Although the asteroid or comet appears to have burst in the air rather than hitting the surface, this event still is referred to as an impact. Estimates of the energy of the blast range from 3 to as high as 30 megatons of TNT with 10–15 megatons of TNT. This is about 1,000 times more powerful than the atomic bomb dropped on Hiroshima, Japan; and about two-fifths the power of the later Soviet Union’s own Tsar Bomba (the largest nuclear weapon ever detonated).
The Tunguska explosion knocked down an estimated 80 million trees over an area covering 2,150 square kilometres (830 sq mi). It is estimated that the shock wave from the blast would have measured 5.0 on the Richter scale. An explosion of this magnitude is capable of destroying a large metropolitan area. This possibility has helped to spark discussion of asteroid deflection strategies.
Where is the event?
Worldwide
Asteroid Day 2015
June 30, 2015 in the World
Asteroid Day is an annual global awareness movement that brings people from around the world together to learn about asteroids and what we can do to protect our planet, our families, communities, and future generations. Asteroid Day will be held on the anniversary of the 1908 Siberian Tunguska event, the largest asteroid impact on Earth in recent history.
Astrophysicist Dr. Brian May, founding member and lead guitarist of the rock band Queen, joined Lord Martin Rees, the UK Royal Astronomer at the London Science Museum to host a press conference to announce ASTEROID DAY, a global awareness campaign to educate the world about asteroids. A central focus of the event was the release of a 100x Declaration, calling for the 100­fold increase in the detection and monitoring of asteroids. Lord Rees read the declaration, which resolves to “solve humanity’s greatest challenges to safeguard our families and quality of life on Earth in the future.
The Declaration calls for three key actions:
– Employ the available technology to detect and track near­Earth asteroids that threaten human populations
– A rapid hundred­fold (100x) acceleration of the discovery and tracking of NEOS.
– Global adoption of Asteroid Day on June 30, 2015, to heighten awareness of the asteroid hazard and our efforts to prevent future impacts.
The 100x Declaration was signed by more than 100 noted scientists, physicists, artists and business leaders from 30 countries, including, Richard Dawkins, Bill Nye, Brian Cox, Anousheh Ansari, Kip Thorne, Stewart Brand, investors Shervin Pishevar and Steve Jurvetson, Alan Eustace and Peter Norvig of Google, Peter Gabriel, Jane Luu, Helen Sharman, Jill Tarter and more than 38 astronauts and cosmonauts.
Where is the event?
Worldwide
Historical Events on 30th June:
350 – Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed by troops of the usurper Magnentius, in Rome.
1397 – Denmark, Norway & Sweden sign Union of Kalmar under Queen Margaretha
1520 – Spanish conquistadors under Hernán Cortés take gold from Aztecs
1651 – The Deluge: Khmelnytsky Uprising – the Battle of Beresteczko ends with a Polish victory.
1755 – Philippines close all non-catholic Chinese restaurants
1834 – Congress creates Indian Territory (now Oklahoma)
1860 – The 1860 Oxford evolution debate at the Oxford University Museum of Natural History takes place
1863 – Dutch colony Suriname counts population of 33,000 slaves
1894 – Korea declares independence from China, asks for Japanese aid
1894 – London’s Tower Bridge opens
1905 – The crew of the Russian battleship “Georgei Pobiedonosets” mutinies in support of the “Potemkin”, which mutinied three days earlier
1905 – In Russia, the “Potemkin” arrives at Odessa, where sailors take the bodies of dead crewman ashore; sailors join civilians in revolutionary actions of the ‘1905 Revolution’
1908 – Tunguska Event: a giant fireball most likely caused by the air burst of a large meteoroid or comet impacts in Siberia
1910 – Russia absorbs Finland
1930 – 1st round-the-world radio broadcast Schenectady NY
1938 – Superman 1st appears in DC Comics’ Action Comics Series issue #1
1948 – Last British troops leave Israel
1953 – 1st Chevrolet Corvette manufactured
1954 – Largest check: Internal US Treasury check at $4,176,969,623.57
1962 – Rwanda & Burundi become independent
1972 – One leap second is added to the UTC time system; also 1981, 1982, 1983, 1985
1981 – China’s Communist Party condemns late Mao Zedong’s policy
1984 – Last sixpence minted in Great-Britain (in use since 1551)
1987 – The Royal Canadian Mint introduces the $1 coin, known as the Loonie
1990 – East & West Germany merge their economies
1997 – Leap Second to synchronize atomic clocks
2005 – Spain legalizes same-sex marriage

 

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