At a time when scientific research in the United States was still in its infancy, George Ellery Hale, a solar astronomer from the University of Chicago, founded the Mount Wilson Observatory in 1904.

At these wavelengths, greenhouse gases that were largely transparent to incoming solar radiation are more absorbent.

At least two fundamental non-terrestrial energy sources have been proposed: solar-powered energy generation ( unhampered by clouds ), either directly by solar cells or indirectly by focusing solar radiation on boilers which produce steam to drive generators ; and electrodynamic tethers which generate electricity from the powerful magnetic fields of some planets ( Jupiter has a very powerful magnetic field ).

At Earth and all the other planets with intrinsic magnetic fields, some solar wind plasma succeeds in entering and becoming trapped within the magnetosphere.

At Earth, the solar wind plasma which enters the magnetosphere forms the plasma sheet.

At the beginning of the solar system, there were several relatively short-lived radionuclides like < sup > 26 </ sup > Al, < sup > 60 </ sup > Fe, < sup > 53 </ sup > Mn, and < sup > 129 </ sup > I present within the solar nebula.

At that time, the astrologer had an important role, responsible for interpreting and predicting the course of government according to the influence of the Sun, Moon, and stars, as well as other phenomena such as solar eclipses and earthquakes.

At the midpoints between these four solar events, cross-quarter days are celebrated.

At 1 AU the solar power flux density is about 1370 W / m < sup > 2 </ sup >, resulting in a pressure under:

At this distance, the dust belt may be analogous to the Kuiper belt that lies outside the orbit of Neptune in the solar system.

* March 10, 2130: At 07: 32 UTC, Sun passes through solar system barycenter.

" At ground level, however, " solar EMP " is not known to produce an E1 or E2 component.

At issue was the noise expected to be generated by the numerous stirling engines to be used to position the collectors and the wisdom of industrial solar facilities.

At distances of ~ 94 AU from the Sun, the solar wind undergoes a transition, called the termination shock, from supersonic to subsonic speeds.

At solar noon, h = 0. 000 so of course, cos ( h )= 1, and before and after solar noon the cos (± h ) term

At the precise moment of the new moon and a solar eclipse, five celestial bodies ( the Sun, the Moon, Mercury, Venus, and Jupiter ) were clustered within three degrees of each other, with the Earth in close conjunction with them.

At night, temperatures descend drastically to slightly above 0 ° C, while during the day, the weather is dry and solar radiation is high.

At Ellicott's Mills, Banneker made astronomical calculations that predicted solar and lunar eclipses for inclusion in his ephemeris.

At Ursinus he worked for several years developing a digital electronic computing machine to test the theory that solar fluctuations, sun spots in particular, affect our weather.

At noon on 24 June, the temporal dignitaries — the 126 members of both the Senate and magistrates that comprised the court — declared Alexei guilty and sentenced him to death.

" At noon, Johnson conducted his first cabinet meeting in the Treasury Secretary's office, asked all members to remain in their positions, and directed the appropriate members to initiate Lincoln's funeral arrangements.

* 1889 – At high noon, thousands rush to claim land in the Land Run of 1889.

At about noon on 2 May 1997, Major officially returned his seals of office as Prime Minister to The Queen.

At noon on the longest day the plane of longitude passing through Marseilles is exactly on edge to the sun.

At noon on the winter solstice the sun stands at 9 cubits and the longest day on the summer solstice is 16 hours at the baseline through Celtica.

At noon came the office of Sext and the midday meal.

At noon, the anti-unionist bishops of Skara and Strängnäs were led out into the great square and beheaded.

* April 22 – At high noon in Oklahoma Territory, thousands rush to claim land in the Land Run of 1889.

At 11: 30 am, 24 ships of the French fleet cut their anchor lines and began sailing out of the bay with the noon tide, leaving behind the shore contingents and ships ' boats.

At noon on 24 November 1934 several thousand students of the Czech University protested before the German university building.

At noon, Longstreet arrived on the field from Thoroughfare Gap and took position on Jackson's right flank.

At noon on December 9, the military dropped leaflets into the city, urging the surrender of Nanking within 24 hours, promising annihilation if refused.

At noon that same day ( May 4, 1429 ), apparently to secure the entry of more provisions convoys ( which had taken the usual circuitous route via the east ), Dunois launched an attack on the easterly English bastille of St. Loup together with the Montargis-Gien troops.

At noon the troop was halted at a temporarily deserted kraal while Louis and Carey made some sketches of the terrain, and used part of the thatch to make a fire.

At noon on that day, the military dropped leaflets into the city, urging the surrender of Nanking within 24 hours:

At noon Zhang Hongfan attacked from the front, hiding additional soldiers under large pieces of cloth.

At noon, a skit with an old west shoot out is put on in the center of town.

At about noon, men on the surface reported a rumbling sound, which was followed by clouds of dust from the main entrance and fan-house.

At noon on every January 1 since 1994, residents and visitors have gathered on the dock in front of the Nordland General Store for the Polar Bear Dip, organized by store owner Tom Rose.

At the first restaurant he sensibly pulled up to go in for his dinner, and as a consequence did not see Cobb strike the open range at the mouth of the canyon and head straight across the swells for Antler.

At once my ears were drowned by a flow of what I took to be Spanish, but -- the driver's white teeth flashing at me, the road wildly veering beyond his glistening hair, beyond his gesticulating bottle -- it could have been the purest Oxford English I was half hearing ; ;

At once the whole band set off at a lope.

At the moment he was excited about his son's having received the Prix De Rome in archaeology and was looking forward to being present this summer at the excavation of an Etruscan tomb.

At the beginning of the play she has partial illumination and at the end she has complete illumination, but there has been no question but that she moves toward the dark.

At the time of his capture Helion had on his person a sketchbook he had bought at Woolworth's in New York.

At the same time, I am aware that my recoil could be interpreted by readers of the tea leaves at the bottom of my psyche as an incestuous sign, since theirs is a science of paradox: if one hates, they say it is because one loves ; ;

At Sounion there is a group of beautiful columns, the ruins of a temple to Poseidon, of particular interest at that time, as active reconstruction was in progress.

At the risk of losing my charge-a-plate at Marshall Field and Company, I would like to challenge an old and hallowed stereotype.

At Khrushchev's door, therefore, can be placed the primary blame but also at fault are those who permitted themselves to be intimidated.

Having hedged its bets in this way, PHS apparently decided it would be possible to make some sort of determination after all: `` At present radiation levels, and even at somewhat higher levels, the additional risk is slight and very few people will be affected ''.

At least in Indonesia, Khrushchev found an American proud to be at total war with Communism ''!!

At 2130 hours they had passed through the barbed wire at the point of departure.

At the same time he started walking the streets, peering at the people passing or shopping at the stalls, storing up fresh impressions of what they looked like, how they moved.

`` At three o'clock if it will be of convenience to you at that time ''.

At two thirty he sent Fujimoto to the top of the wall at the northeast corner of the mission to keep an eye on the ridge road and give a signal when he first glimpsed the approach of Kayabashi's party.

At that time, he afforded me the courtesy of his busy workday for such length as I may need, to speak about my background, my hopes, my views on various national and local topics, and any problems that I may have been vexed with at the time.

At the outset, the Government's spokesman explained that counsel for the Government and for Du Pont had already held preliminary discussions with a view to arriving at a relief plan that both sides could recommend to the court.

At the age of 17 he became an apprentice machinist at the shop of Walcott & Harris in Valley Falls, Rhode Island, and following two or three other jobs in quick succession after graduation, he went into business for himself in 1831, making lathes and small tools.

At Cypress Gardens special bleachers are set up for photographers at water-ski shows and lovely models pose for pictures in garden settings.

At the fifteenth magnitude, Af, and at the twenty-fifth magnitude, Af.

At the end of the run, the strips in the third and sixth positions in each chamber were dried, stained for 1 hr, washed and dried, while the other strips were maintained in a horizontal position at 1-degree-C.

At the end of work one day, the personnel man took the applicants one at a time, asked them to sit behind the receptionist's desk and he then played the role of a number of people who might come to the receptionist with a number of queries and for a number of purposes.

At the conclusion of the washing, 8 liters of water at 90-degrees-F ( 32*0C. ) are automatically metered from the rinse reservoir to the washing tubs, 4 liters to each tub.