Book, Paragraph

 1 III,  2|     nature and cause of halo, rainbow, mock suns, and rods, since
 2 III,  2|  about sunrise or sunset.~The rainbow never forms a full circle,
 3 III,  2|    the same, but in the outer rainbow they are fainter and their
 4 III,  2|     is reversed. In the inner rainbow the first and largest band
 5 III,  2|     band is red; in the outer rainbow the band that is nearest
 6 III,  2|  These are the colours of the rainbow, though between the red
 7 III,  2|       object takes place.~The rainbow is seen by day, and it was
 8 III,  2|   appeared by night as a moon rainbow. This opinion was due to
 9 III,  2|       two instances of a moon rainbow in more than fifty years.~
10 III,  3|     opposite the sun like the rainbow.~Since the reflection takes
11 III,  4|       already stated that the rainbow is a reflection: we have
12 III,  4|    conditions under which the rainbow appears. So it is clear
13 III,  4|       So it is clear that the rainbow is a reflection of sight
14 III,  4|      sight to the sun.~So the rainbow always appears opposite
15 III,  4|     both reflections, but the rainbow is distinguished by the
16 III,  4|      mist. That is why in the rainbow reflection the outer circumference
17 III,  4|    would be coloured like the rainbow. Actually no complete or
18 III,  4|       we maintain, a complete rainbow like that which we do find
19 III,  4|     which we do find lamps. A rainbow appears round these in winter,
20 III,  4|      shows the colours of the rainbow; but because the sight that
21 III,  4|      dark, red is absent. The rainbow that is seen when oars are
22 III,  4|  fully formed water. We get a rainbow, too, if a man sprinkles
23 III,  4|      standing outside, sees a rainbow where the sun’s rays cease
24 III,  4|       That the colours of the rainbow are those we described and
25 III,  4|     water it shows a trace of rainbow colouring. Clearly, then,
26 III,  4|      to sense. Hence also the rainbow appears with three colours;
27 III,  4|     outer band of the primary rainbow is red: for the largest
28 III,  4|       of colours are true the rainbow necessarily has three colours,
29 III,  4|   this from the fact that the rainbow is purest when the cloud
30 III,  4|   most yellow. (Yellow in the rainbow comes between red and green.)
31 III,  4|    the green. Again, when the rainbow is fading away and the red
32 III,  4|  becomes yellow. But the moon rainbow affords the best instance
33 III,  4|     We have now shown why the rainbow has three colours and that
34 III,  4|     cause explains the double rainbow and the faintness of the
35 III,  4|     reflection from the outer rainbow is weaker because it takes
36 III,  4|     is nearest to the primary rainbow. Now the smallest band in
37 III,  4|    smallest band in the outer rainbow is that which is nearest,
38 III,  4| principle. Let B be the outer rainbow, A the inner one; let R
39 III,  5|                         5~The rainbow can never be a circle nor
40 III,  5|       other properties of the rainbow. (See diagram.)~Let A be
41 III,  5| autumn equinox there may be a rainbow at any time of the day,
42 III,  5|     equinox there cannot be a rainbow about midday. The reason