Determine the date if the calendar is no longer kept?
Hey everyone,
I'm currently watching The Walking Dead again and was wondering if it's possible to restore the old calendar if there have been no calendars or clocks for a few months/years and no one can remember for sure how many days have passed since the end of the calendar.
What scientific methods are there that could theoretically be used for this purpose?
For the sake of simplicity, let us assume that all the necessary energy, technology and knowledge is available.
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It may not be as accurate to the second/microsecond as nowadays… but it can be noted.
With a sunglass you can capture the time of day. The shadow length and limitations give you maximum height and day length. Very rough: On 21 June the longest day is, on 21 June December the shortest.
Then you can take the phases of the moon with it and land in a rough division in months. Observing the stars makes you much more.
hmm, it’s just how it needs to be done!
After all, you can even find that the Earth is ‘after’ as it moves ‘more uneven’ than an atomic clock. And whenever you have a second deviation full, a switching second is inserted. This now happens so often (every few years) that it is discussed whether you should not take larger breaks, e.g. 1 min.
after a “dark” phase of civilisation, an exact date is not absolutely necessary because you simply set a new “time zero”.
since the surviving of the last calendar and its parameter should be known, they can use a sunglass clock to determine the corner points of the sun and thus the seasons or months. relatively precise mechanical ears should also not be a problem, with it being possible to dispense with seconds at the beginning. So tags, weeks and months to re-determine should not be too big a problem.
In any case, one can determine the position of the earth relative to the sun, i.e. the day. Mittsommer, Tag&Nacht-Gleiche, Wintersonnwende, …
For the year, you would have to count annual rings on trees and compare them with old documents…
With more technology you could also determine the exact year using the moon or the planet in the solar system. Since they have different circulation times, the exact year can be determined even after a very long period of time, whether 50 or 500 years!
Then we go to Stonehenge and wait for the summer turn. This has worked thousands of years and the sun still turns the same.
after a year at the latest, one knows which day the sun has risen or fallen in the north and thus knows the 21st. June of year 1 after the big collapse.