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#calendars

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Tolkien's manuscript.

This is from another area of Tolkien's mind: calendars.
He was pretty obsessed with making calendars for his Middle-earth. He wrote a big appendix to "The Lord of the Rings" about it, and wrote a great deal about the calendars before settling on the text as printed in Appendix D of "The Lord of the Rings".

I also feel like making a Font of Tolkien's own pen writing. What do you think?

University of Edinburgh: Most AI struggles to read clocks and calendars. “While AI models can perform complex tasks such as writing essays and generating art, they have yet to master some skills that humans carry out with ease, researchers say. An Edinburgh team has shown that state-of-the-art AI models are unable to reliably interpret clock-hand positions or correctly answer questions about […]

https://rbfirehose.com/2025/03/15/university-of-edinburgh-most-ai-struggles-to-read-clocks-and-calendars/

ResearchBuzz: Firehose | Individual posts from ResearchBuzz · University of Edinburgh: Most AI struggles to read clocks and calendars | ResearchBuzz: Firehose
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Fortgeführter Thread

The issue here is that 28 days doesn't match up with any lunar cycles. The synodic month is a shade over 29½ days long, so any timekeeping system that synchronises with the phases of the moon will have months of 29 or 30 days.

The sidereal and draconic months are just over 27 days long; months that synchronise with those moon cycles will occasionally be 28 days long, but will more often have 27 days.

3/?

#Months#Moon#Timekeeping

It’s Julian day 2460666! 😱 Time for the end-time preachers to dust off their 'The End is Nigh' signs! But honestly, I think it’s just a great day to explore some interesting systems of keeping track of time!

For those who don’t know, the Julian Day Number (JDN) is a continuous count of days since the Julian calendar began on January 1, 4713 BCE. It’s used by astronomers and historians to simplify date calculations across different calendars.

So, while some might panic, I’m just here for the cosmic fun! 😈😂

I even wrote a simple shell function to get the Julian Day Number for today or any given date:

```
fish

function jdn
# Get the date from the argument or use the current date
if test (count $argv) -eq 0
set date (date -u +%Y-%m-%d) # Use current date if no argument is provided
else
set date $argv[1] # Use the provided date
end

# Convert the date to seconds since epoch
set seconds (date -u --date="$date" +%s)

# Calculate JDN using the formula
set jdn (math "$seconds / 86400 + 2440587")

echo "Julian Day Number for $date: $jdn"
end
```

Just a note: this function only works with dates UNIX time 01.01.1970 so it won’t apply to dates before.