what is the point of trooping the colour
Trooping the Colour Trooping the Colour is an old ceremony whereby a battalion would fall in by companies and the colour-party would "troop" or march the colours through the ranks so that every man would see that the colours were intact. This was done before and after every battle. This ceremony has been retained through time and is today largely ceremonial.
Rainbow Rainbows span a continuous spectrum of colours. Any distinct bands perceived are an artefact of human colour vision, and no banding of any type is seen in a black-and-white photo of a rainbow, only a smooth gradation of intensity to a maximum, then fading towards the other side. For colours seen by the human eye, the most commonly cited and remembered sequence is Newton's sevenfold red, orange, yellow, green, blue, indigo and violet,[2][3] remembered by the mnemonic, Richard Of York Gave Battle In Vain (ROYGBIV).