Each band or layer of the pyramid represented five degrees of the dome of the sky

this (5º) is a common 'celestial' increment-- a full moon is about 5º of the 'arc' of the sky (which from horizon to horizion is about 180º)--its a handy 'measurement' to know, since your 'thumb' held at arms lenght is just about the right size to 'cover the moon'.. so you can use a 'rule of thumb' to measure celestial distances.. useful when a news article says 'planet X can be seen 20º to the south of the moon at 9PM' --as they are want to do.. knowing the 'size of the moon is 5º, its easy to figure out 20º, or any other odd number, not precicely, but close enough.


my other obsession