File:SpringFwd-FallBack.jpg
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Summary[edit]
| Description |
English: The biological basis for “Spring-Forward/Fall-Back”:
The “Spring-Forward/Fall-Back” adjustment is explained as a correction of rigid mechanical time toward flexible natural time so that clock time shifts toward the natural synchronization of our body clocks to the sunrise as it changes throughout the seasons. The natural cycle shown in Chart #2 is more closely matched by Chart #4 (with the Spring-Forward/Fall-Back shift) rather than the unshifted Chart #3. Natural time is called flexible (where "the hours bend") because hours historically were divisions of time from sunrise to sunset. Sunrise to noon was divided equally, as was noon to sunset. Also sunset to midnight and midnight to sunrise. So Summer had longer daytime hours and short nighttime hours. Winter had shorter day-hours with longer night-hours. |
| Date | |
| Source | Own work |
| Author | Invent2HelpAll |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:25, 7 March 2009 | | 1,280 × 1,024 (1,013 KB) | Invent2HelpAll | {{Information |Description={{en|1=The biological basis for “Spring Forward / Fall Back”: The Spring Forward-Fall Back adjustment is explained as a correction of rigid mechanical time toward flexible natural time so that clock time shifts toward the n |
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