STI/Astroport.ONE
STI
/
Astroport.ONE
4
1
Fork 2
Code Issues 11 Pull Requests Projects Releases 1 Wiki Activity

solar time calculator

This commit is contained in:
fred 2023-10-08 17:07:21 +02:00
parent 6cd0fc7403
commit 207b28875d
1 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
tools/time2solar.sh
View File

@ -1,34 +1,34 @@
#!/bin/bash
# Input longitude in degrees (positive for East, negative for West)
longitude_deg=$1
longitude=$1
# Check if longitude is numeric
if ! [[ $longitude =~ ^[+-]?[0-9]+(\.[0-9]+)?$ ]]; then
echo "Invalid longitude input. Please provide a valid numeric value."
exit 1
fi
# Determine if it's East or West longitude
if [ $longitude_deg -ge 0 ]; then
if [ $(echo "$longitude >= 0" | bc) -eq 1 ]; then
direction="East"
else
direction="West"
fi
# Calculate the time offset in minutes
offset_minutes=$((longitude_deg * 4))
# Calculate the time offset in minutes using awk for floating-point arithmetic
offset_minutes=$(echo "$longitude * 4" | bc)
# Determine if it's ahead or behind UTC
if [ "$direction" == "West" ]; then
offset_minutes=$((offset_minutes * -1))
offset_minutes=$(echo "$offset_minutes * -1" | bc)
fi
# Get the current UTC time in hours, minutes, and seconds
current_utc_time=$(date -u +%H:%M:%S)
# Convert the UTC time to seconds since midnight
current_utc_seconds=$(date -u -d "$current_utc_time" +%s)
# Calculate the solar noon time in UTC (12:00 PM)
solar_noon_utc_seconds=$((12 * 3600))
# Adjust the solar noon time by the offset in seconds
local_solar_noon_seconds=$((solar_noon_utc_seconds + offset_minutes * 60))
local_solar_noon_seconds=$(echo "$solar_noon_utc_seconds + ( $offset_minutes * 60 )" | bc | cut -d '.' -f 1)
# Convert the local solar noon time to hours, minutes, and seconds
local_solar_noon_time=$(date -u -d "@$local_solar_noon_seconds" +%H:%M:%S)
@ -37,7 +37,7 @@ local_solar_noon_time=$(date -u -d "@$local_solar_noon_seconds" +%H:%M:%S)
new_time_seconds=$((local_solar_noon_seconds + 8*3600 + 12*60))
new_time=$(date -u -d "@$new_time_seconds" +%H:%M:%S)
echo "Longitude: $longitude_deg degrees $direction"
echo "Longitude: $longitude degrees $direction"
echo "Time Offset: $offset_minutes minutes"
echo "Local Solar Noon (midday) Time: $local_solar_noon_time"
echo "Local Solar Noon + 8h 12mn: $new_time"