Time 2 Solar v1

tools/time2solar.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# Input longitude in degrees (positive for East, negative for West)
+longitude_deg=$1
+
+# Determine if it's East or West longitude
+if [ $longitude_deg -ge 0 ]; then
+  direction="East"
+else
+  direction="West"
+fi
+
+# Calculate the time offset in minutes
+offset_minutes=$((longitude_deg * 4))
+
+# Determine if it's ahead or behind UTC
+if [ "$direction" == "West" ]; then
+  offset_minutes=$((offset_minutes * -1))
+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=$((solar_noon_utc_seconds + offset_minutes * 60))
+
+# Convert the local solar noon time to hours, minutes, and seconds
+local_solar_noon_time=$(date -u -d "@$local_solar_noon_seconds" +%H:%M:%S)
+
+# Add 8 hours and 12 minutes to the local solar noon time
+new_time_seconds=$((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 "Time Offset: $offset_minutes minutes"
+echo "Local Solar Noon (midday) Time: $local_solar_noon_time"
+echo "Local Solar Noon + 8h 12mn: $new_time"