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6) at a finite distance from the axis (or with an infinitely O distant object, a point which subtends a finite angle at the system) is, in general, even then not sharply reproduced, if the pencil of rays issuing FIG.

00The earth would intercept an amount of it proportional to the solid angle it subtends at the sun; that is to say, it would receive a deposit of meteoric matter about one-tenth of a millimetre, of density say 2, over its whole surface in the course of the year.

00subtends an area 17 by 13 arc minutes in size.

00This constant length subtends an angle of about 40" at the earth; the " constant of aberration " is half this angle.

006) at a finite distance from the axis (or with an infinitely O distant object, a point which subtends a finite angle at the system) is, in general, even then not sharply reproduced, if the pencil of rays issuing FIG.

00The earth would intercept an amount of it proportional to the solid angle it subtends at the sun; that is to say, it would receive a deposit of meteoric matter about one-tenth of a millimetre, of density say 2, over its whole surface in the course of the year.

00The galaxy subtends an area 17 by 13 arc minutes in size.

00

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