DTV_ — Calendar day is misdefined

In clause 9.5.3, 'calendar day' is defined as: 'time point that is defined by a given calendar and during which approximately one revolution of the earth occurs on its axis'. Clause 9.3 defines 'time point' as 'scale point that is in a time scale and that specializes the concept 'time interval'. Fortunately, 9.3 also says 'time point' is a concept type, so the idea of specialization makes sense. That is, the definition in 9.3 means: a time point is a scale point on a time scale, and a time point is a concept that specializes 'time interval'. A concept that specializes time interval is not a time interval during which the earth rotates – its instances are.

Recommendation:

In clause 9.5.3, change the definition of calendar day to 'time point that is defined by a given calendar and that corresponds to time intervals during which approximately one revolution of the earth on its axis occurs'.
In clause 9.3 reword the definition of time point to 'concept that specializes the concept time interval and that is a scale point on a time scale.

The recommendation is adopted as given.

(The change to the definition of ‘time point’ is accomplished by the resolution to issue 16665.)