This little script helps with Remind Calendars
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<code>
#!/bin/bash
# This script creates a file called SolarDataReminders that contains precise times and dates
# for Perihelion, Equinox, Solstice, and Aphelion. It can be added to your ~/.reminders
# file, or included in a other ways.

# The list of sun positions below is from the Astronomical Applications 
# Department of the U.S. Naval Observatory 

# Widely speaking, it connects to their website over and over again, replacing ${Year} with
# each of a sequence of years between 2022 and 2100.
# The grep below then looks for the partial words helion quinox and olstice, but removes the 
# line that also says 'Earth's Seasons'
# The sed script converts multiple spaces to singles, and removes leading and trailing space
# The result gets sent to a temporary file.
 
# Then, read in from that file, one line at a time, breaking the words of each line to get
# what Event, and the Year, Date, and Time, then convert the time from 6:10 to 6,10.
# Write the results out to a Remind statement in the form of;
# REM [trigger(date(2100,January,3), time(13,54), 1)] MSG Perihelion
# to a second file, do this in a loop for a years records, then delete the temporary file
# and add a blank line after the year's worth of events.
# Finaly, go back for the next year in the sequence.
 
# Love *nix!

Output=SolarDataReminders
File=$(mktemp)
for Year in $(seq 2022 2100)
 do
 links -dump "https://aa.usno.navy.mil/calculated/seasons?year=${Year}&tz=0&tz_sign=-1&tz_label=false&dst=false&submit=Get+Data" \
      | grep -E 'helion|quinox|olstice' \
      | grep -v "Earth's Seasons" \
      | sed -e 's/  */ /g' -e 's/^ *\(.*\) *$/\1/' \
      >> ${File}

while read Event Year Month Day Time 
 do Comdelimit=$(echo ${Time} | tr ":" ",")
    echo "REM [trigger(date("${Year}","${Month}","${Day}"), time("${Comdelimit}"), 1)] MSG "${Event} ;
 done < ${File} >> ${Output}
rm ${File}
echo >> ${Output}
done
</code>