Environmental Science
The lag in daily temperature refers to the time lag between the:

Time of minimum temperature and the time of maximum solar radiation
Sunrise and sunset
Minimum and maximum temperature for a day
Minimum and maximum solar energy received at the surface for a given day
Time of maximum solar radiation and the time of maximum temperature

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Environmental Science
During the winter solstice in the Northern Hemisphere:

All of these
The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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