·
The sun will always be
behind the viewer
·
The rainbow will always
start at about 42 degrees from the angle of the direction of the sun
·
The higher the sun the
lower the rainbow and vice versa
·
Brighter inside the cone of
the rainbow and darker on the outside of it
·
The red on the outside and
the blue/violet on the inside
·
On the secondary rainbow
the colors are reversed – blue/violet on the outside and red on the inside
·
If the sun is at the horizon
the rainbow may be red
·
The secondary rainbow will
start at about 53 degrees – about ten degrees higher than the primary rainbow
·
The secondary rainbow is
wider and fainter then the primary rainbow
Of course you do not have to follow those points but, I believe it's good to have those in mind.
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