At the instant of any observation of an object, the apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light ( i. e., the line actually taken by the light on its path to the observer ).

At each point in time, the agent performs an action and the environment generates an observation and an instantaneous cost, according to some ( usually unknown ) dynamics.

* 1960 – At the Kasakela Chimpanzee Community in Tanzania, Dr. Jane Goodall observes chimpanzees creating tools, the first-ever observation in non-human animals.

At about the same time as this important discovery, he observed that when " p-particles ", ejected from radio-active substances, impinge upon zinc sulfide, each impact is accompanied by a minute scintillation, an observation which forms the basis of one of the most useful methods in the technique of radioactivity.

At age nine, he codified his observation of insects with a paper titled " The Natural History of Insects ".

At least some of the elementary theorems of a philosophical theory are statements whose truth cannot necessarily be scientifically tested through empirical observation.

* December 9 – At 20: 34 UTC Mercury occults Saturn ( there are no observation records ).

At first sight, the observation does not appear to be ' basic '.

At the time of the observation, the comet was 99. 5 million miles from Earth and 115. 3 million miles from the Sun.

At the urging of the Lebanese government, UNTSO created an observation operation along the Lebanese border ( 1949 Armistice Demarcation line ) in the spring of 1972.

At first observation, the day after the operation, the back of Head's hand and the dorsal surface of his thumb were seen to be " completely insensitive to stimulation with cotton wool, to pricking with a pin, and to all degrees of heat and cold.

At Olympia, for example, they were set apart from the general population for lengthy training periods and the observation of a complex series of prohibitions that included abstinence from intercourse.

At each time, the agent receives an observation, which typically includes the reward.

At the observation in her honour on the second day of the month Gorpiaeus, one of the young men lay on the ground vicariously experiencing the throes of labour.

At the summit is a center with a museum, gift shop, observation area, and cafeteria.

At five o ' clock in the morning, Villars and his principal lieutenants drew up their plan of attack at Avesnes-le-Sec ; they choose the windmill there as a vantage point for observation of the surrounding lowland.

At this time astrology and astronomy were not distinguished as separate disciplines ; the act of astronomical observation was often done by someone who had astrological motives for doing so.

At night he dedicated his time to astronomical observation, making the upper story of his home into an observatory.

At the same time, other dedicated programs focused on galaxies that were already known through ground-based observation.

At 09: 00 a forward observation officer attached to the 2nd Parachute Battalion managed to make radio contact with the British cruiser HMS Newfoundland, which then used its 6-inch guns to target the Fallschirmjäger positions.

At the time of observation, Washoe showed no signs of having learned the sign, but on a later occasion she reacted to the sight of a toothbrush by spontaneously producing the correct sign, thereby showing that she had in fact previously learned the ASL sign.

At the top of the building is a slender observation tower topped by a flagpole.

At its simplest, the actual staining process may involve immersing the sample ( before or after fixation and mounting ) in dye solution, followed by rinsing and observation.

At the beginning of the Second World War, Royal Artillery officers, with the assistance of RAF technicians, flew Auster observation aircraft under RAF-owned Air Observation Post ( AOP ) Squadrons.

At present, a lone Jewish woman from Belgium lives near the camp, dedicating her life to memorializing the Shoah.

At the 2010 10th Conference of Parties ( COP ) to the Convention on Biological Diversity in October in Nagoya, Japan, the Nagoya Protocol was adopted.

At the end of the Heimskringla saga Hákonar saga góða, the poem Hákonarmál by the 10th century skald Eyvindr skáldaspillir is presented.

At the beginning of the 10th century a Duchy of Franconia ( German Herzogtum Franken ) was established within East Francia, which comprised modern Hesse, Palatinate, parts of Baden-Württemberg and most of nowaday's Franconia.

At that time, the climate was not unlike today's, but there was a slightly warmer period from the 10th – 14th centuries known as the Medieval Warm Period.

At the end of the 10th century, much of what is now Republic of Macedonia became the political and cultural center of the First Bulgarian Empire under Tsar Samuil ; while the Byzantine emperor Basil II came to rule the eastern part of the empire ( what is now Bulgaria ), including the then capital Preslav, in 972.

At the time of Svatopluk I and King Arnulf of Carinthia in the 9th century, Silesia was a part of Greater Moravia ; after its destruction in the early 10th century, it was conquered by Bohemia.

At the end of the 10th century, the Hokke family of the Fujiwara clan held political power in Japan through the Sesshō and Kampaku regency system, and the emperor was more of a figurehead.

At 10, 000, Canterbury had the 10th largest population in England ; by the early 16th century, the population had fallen to 3, 000.

At the time of Operation Market-Garden, the 10th SS Panzer Division had an approximate strength of 3, 000 men ; an armoured infantry regiment, divisional reconnaissance battalion, two artillery battalions and an engineer battalion, all partially motorized.

At the Second Battle of Bull Run, the 5th New York, along with another Zouave regiment, the 10th New York " National Zouaves ", held off the flanking attack of James Longstreet's Corps for ten crucial minutes before it was overrun.

At the beginning of the 10th century this was the site of several places sacred to the Slavic religion.

At the end of the 10th century it became a toll ( Maut in German ) station for ships, and the name " Muthusen " for the settlement is first mentioned in 1007

At the outbreak of war in August 1914, he was adjutant of the 1st Battalion, 10th Infantry Regiment König.

At some time prior to the 10th century it would have been a fishing village on a sandy beach backed by pebbles and a creek, It was improved by the Count of Flanders in 997 and fortified by the Count of Boulogne in 1224.

At the end of the Heimskringla saga Hákonar saga góða, the poem Hákonarmál ( by the 10th century skald Eyvindr skáldaspillir ) is presented.

At last, Brahama, pleased with his austerity, appeared after his 10th decapitation and offered him a boon.

At the 10th anniversary of the destruction of the Babri mosque, the VHP wanted to perform a shila daan, or a ceremony laying the foundation stone of the cherished temple at the disputed site.

At the beginning of 10th century, it became a vassal of the Artsrunis of Vaspurakan.

At the beginning of May soldiers from Charlie Company, 2nd Battalion, 30th Infantry Regiment, 10th Mountain Division placed additional barriers along the eastern boundary of Sadr City to isolate the militants ' stronghold, but met heavy resistance as Mahdi Fighters attacked the soldiers with RPGs, IEDs, and small arms fire.

At the opening of the 10th Session ( February 1673 ), Job Charlton ( MP Ludlow ) was elected as the new speaker, but resigned after a month on account of ill-health.

At that time they lasted two days but they were extended until the 10th and nowadays endure until the 14th.

At the, Räikkönen qualified 10th, but took the lead on lap 11 and held on to it to take McLaren's only win of the season.

At a gathering of farmers celebrating the 10th anniversary of the founding of MAS in March 2005, Morales declared, " MAS is ready to rule Bolivia ", having " consolidated its position as the political force in the country ".

At Talladega Labonte finished 10th place, and at one point was running second in that race to Dale Earnhardt, Jr.