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Word: orbital (lookup in dictionary) (lookup stats)
Dates: during 1930-1939
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Usage:

...cool Maine, blandly told them they were enjoying a period of cool summers which began 4,500 years ago and would last 6,500 years more. Germany's Dr. Rudolf Spitaler first suspected that the northern hemisphere has warm summers when the eccentricity of earth's orbit swings it close to the sun during the northern summer...

Author: /time Magazine | Title: Science: Penrose's Party | 8/7/1933 | See Source »

...Earth. Only heavenly things known to have ever approached closer were the regular PonsWinnecke comet (3,500,000 mi., June 27, 1927) and the vanished Lexell comet (1,500,000 mi. in 1770). Another point: the Reinmuth Object swung within the Earth's orbit. Only the Moon and an occasional comet head have been known to do that. The heavy Moon (2,160 mi. diameter), averaging 238,857 mi. from Earth, is gripped as a satellite. The 3-mi. Reinmuth Object four to eight million miles out might conceivably be held as a second moon within Earth...

Author: /time Magazine | Title: Science: Two New Objects | 6/6/1932 | See Source »

...meteor which I observed was of the approximate brilliancy of Venus, greater than a first magnitude star. It did not belong to any one of the showers that the earth encounters in the round of its orbit, like the Leonids which illuminate the skies near the end of November or the Persoids which may be seen in great numbers during August...

Author: NO WRITER ATTRIBUTED | Title: Observatory Receives Many Replies To Appeal For Meteor Reports--Millman Reveals Significance of Astral Nomads | 3/4/1932 | See Source »

...shower, which has taken place every 33 years for more than ten centuries, failed to appear when last due in 1899, which was attributed to the hugo planet Jupiter being too close to their orbit, and pulling them out of their course...

Author: NO WRITER ATTRIBUTED | Title: FISHER AND ASTRONOMY STUDENTS WILL STUDY LEONID METEOR SHOWER | 11/14/1931 | See Source »

Some account of Planet P was made known in 1928. Now, however, Professor Pickering has estimated not only its orbit (an ellipse whose distance from the sun varies between 5,000 and 9,000 million mi.) but its diameter (44,000 mi.). It is twice as far from the sun as far-flung Pluto, is the third most massive of the sun's family, exceeded only by Jupiter and ringed Saturn. Its sidereal period: 656 years...

Author: /time Magazine | Title: Science: Planet P? | 11/9/1931 | See Source »

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