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In an orbit made elliptical by the planetary attraction the sun necessarily occupies one of the foci of the ellipse.
OUTLINES OF THE EARTH'S HISTORYNATHANIEL SOUTHGATE SHALERThat an ellipse may be given any required proportion of width to length by locating the foci at the requisite distance apart.
MECHANICAL DRAWING SELF-TAUGHTJOSHUA ROSEThat the proportion of length to width in an ellipse is determined by the distance apart of the foci.
MECHANICAL DRAWING SELF-TAUGHTJOSHUA ROSEThe curve thus traced will be an ellipse having the pins at the two points which are called its foci.
A TEXT-BOOK OF ASTRONOMYGEORGE C. COMSTOCKThese are at points on the principal axis that are twice as far from O, the center of the lens, as are the principal foci.
PHYSICSWILLIS EUGENE TOWERTwo ellipsoids in which the principal sections lie in the same planes, and have the same foci, are called confocal.
THE NEW GRESHAM ENCYCLOPEDIAVARIOUSIn barbarous places, the legions that were intended as garrisons proved to be foci of civilization.
HISTORY OF THE INTELLECTUAL DEVELOPMENT OF EUROPE, VOLUME I (OF 2)JOHN WILLIAM DRAPERTheir physicians were their great philosophers; their medical colleges were their foci of learning.
HISTORY OF THE INTELLECTUAL DEVELOPMENT OF EUROPE, VOLUME I (OF 2)JOHN WILLIAM DRAPERFoci of pus occur throughout the gland, causing destruction of the tissue, so that the gland may become a single abscess cavity.
ENCYCLOPAEDIA BRITANNICA, 11TH EDITION, VOLUME 17, SLICE 2VARIOUSWith the Williamson camera focussing is unnecessary within certain distances owing to the fixed foci of the stops.
PRACTICAL CINEMATOGRAPHY AND ITS APPLICATIONSFREDERICK ARTHUR AMBROSE TALBOT