Strabo used the astronomical cubit ("pēchus", the length of the forearm from the elbow to the tip of the little finger) as a measure of the elevation of the sun. The term "cubit" in this context is obscure; it has nothing to do with distance along either a straight line or an arc, does not apply to celestial distances, and has nothing to do with the gnōmōn. Hipparchus borrowed this term from Babylonia, where it meant 2°. They in turn took it from ancient Sumer so long ago that if the connection between cubits and degrees was known in either Babylonia or Ionia it did not survive. Strabo stated degrees in either cubits or as a proportion of a great circle. The Greeks also used the length of day at the summer solstice as a measure of latitude. It is stated in equinoctial hours ("hōrai isēmerinai"), one being 1/12 of the time between sunrise and sunset on an equinox.