Order of colours in the rainbow, or visual spectrum:
(Red, Orange, Yellow, Green, Blue, Indigo, Violet)
Richard Of York Gave Battle In Vain.
Order of taxonomy in biology:
(Kingdom, Phylum, Class, Order, Family, Genus, Species)
Kids Prefer Cheese Over Fried Green Spinach.
Order of geological time periods:
(Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Recent)
Cows Often Sit Down Carefully. Perhaps Their Joints Creak?
Persistent Early Oiling Might Prevent Painful Rheumatism.
Order of Mohs hardness scale, from 1 to 10:
(Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase feldspar, Quartz, Topaz, Corundum, Diamond)
Toronto Girls Can Flirt, And Other Queer Things Can Do.
The order of sharps in music, called the "circle of fifths":
(F, C, G, D, A, E, B)
Father Charles Goes Down And Ends Battle.
And in reverse for flat keys the mnemonic can be neatly reversed:
Battle Ends And Down Goes Charles' Father.
The notes represented by the lines on the treble clef stave (bottom to top):
(E, G, B, D, F)
Every Good Boy Deserves Favour.
And the notes represented by the spaces between the lines:
(F, A, C, E)
Furry Animals Cook Excellently. Or just the word FACE
The notes represented by the lines on the bass clef stave (bottom to top):
(G, B, D, F, A)
Good Boys Do Fine, Always.
And the notes represented by the spaces between the lines:
(A, C, E, G)
All Cows Eat Grass.
The order of planets in average distance from the Sun:
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto)
My Very Easy Method: Just Set Up Nine Planets.