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THE ZODIACAL LIGHT.
357
In this diagram, the sun's rays being S', S", etc., BO, FO, etc. will be the reflected rays; and the several angles between these lines of incidence and reflection, together with the number of rays reflected
Nebulous Ring, with the Earth for its Centre.
|[The relative proportions of the earth and the ring, and also its distance, are of course not given in this diagram with any effort at certainty; the upward extent of the ring is probably far greater than can be here represented. The diagram is, however, sufficiently correct for our present purposes of elucidation.]
to the eye, out of every 1,000 incident rays, according to Bouguer, are in the following table:
| ANGLE | Rays reflected from Smooth Water. |
Rays reflected from Plate-glass not quick- silvered. | |
| S’ B0 | 161° | 343 | 422 |
| S'' F0 | 146° | 184 | 270 |
| S''' D0 | 131° | 101 | 162 |
| S'''' H0 | 116° | 59 | 105 |
| S''''', at midnight | 90° | 18 | 25 |
| S'''''', C0 | 67° | 18 | 25 |
