Emily (via email) submitted:

Image transcription, since it’s a little blurry:

The word “day” can be used caledrically or non-calendrically, to refer to the whole daily cycle, or it can refer just to the daylight portion of the cycle, in opposition to “night”. The word “morning” can be to refer to the daylight hours before noon, or to that part of thecalendar before noon. Thus, the “morning” is that part of the “day” which ends at noon, in either of the two calendric senses of “day”. Next time you hear someboday say, “Why are you calling me in the middle of the night? Don’t you realize it’s three o’clock in the morning?”, point out to him that he has chosen the word “night” from the day-subdivision cycle which is not put in phase with the calendar day and that he has chosen the word “morning” from the day-subdivision cycle which is put in phase with the calendar day, and explain to him that the reason is that only the latter is appropriate in expressions of clock time.