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The method in mathematical physics refers to
AM means air mass.

It is defined as the path length through the atmosphere relative to the vertical thickness of the atmosphere. It is the ratio of the actual distance of light passing through the atmosphere to the vertical thickness of the atmosphere.

AM= 1/cos φ AM0 = external atmosphere am1= vertical am1.5 = sun @ φ = 48.2

There is also a distinction between time: the unit of time in the morning is AM in English.