Culture · 6 pages · 12 min

How daylight saving moves a clock not the sun

Daylight saving renames the hour on the clock. Sunrise does not move.

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From the opening

Daylight saving time changes the number on the civil clock, usually by one hour, so that the same position of the sun is called a later hour. The sun still crosses the meridian when it crosses the meridian; only the label attached to that moment is edited. The opening covers the hour label changes, solar noon keeps its moment, and evening light is borrowed by name.

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Inside

The hour label changes
Solar noon keeps its moment
Evening light is borrowed by name
A zone offset was already there
Where the idea stops applying
A distinction worth keeping

Sources

Daylight saving as a seasonal shift of civil time
William Willett's daylight campaign and wartime clock changes

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How daylight saving moves a clock not the sun

From the opening

Inside

Sources

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