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44 lines
1.5 KiB
PowerShell
44 lines
1.5 KiB
PowerShell
<#
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.SYNOPSIS
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Checks the Moon phase
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.DESCRIPTION
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This script determines the Moon phase and answers by text-to-speech (TTS).
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.EXAMPLE
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PS> ./check-moon-phase
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.NOTES
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Author: Markus Fleschutz · License: CC0
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.LINK
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https://github.com/fleschutz/PowerShell
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#>
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try {
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$LunarCycle = 29.53058868 # synodic period in days, time between successive new moons
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$LunarHalfCycle = $LunarCycle / 2.0
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$Phases = @("New moon", "Waxing crescent moon", "First quarter moon", "Waxing gibbous moon", "Full moon", "Waning gibbous moon", "Last quarter moon", "Waning crescent moon")
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$PhaseLength = $LunarCycle / 8.0
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$PhaseHalfLength = $PhaseLength / 2.0
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$RefDate = get-date -Year 2021 -Month 12 -Day 4 -Hour 6 -Minute 43 # Dec 4, 2021 06:43 UTC [New Moon]
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$Now = get-date
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$TimeInterval = New-TimeSpan -Start $RefDate -End $Now
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$Days = $TimeInterval.TotalDays
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$MDays = $Days % $LunarCycle
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$PhaseIndex = [int]($MDays * (8.0 / $LunarCycle))
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$Visibility = [math]::Round((($Days % $LunarHalfCycle) * 100) / $LunarHalfCycle)
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$Reply = "$($Phases[$PhaseIndex]) with $($Visibility)% visibility"
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$MoonAge = [math]::Round($Days % $LunarCycle)
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if ($MoonAge -eq "0") { $Reply += " today"
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} elseif ($MoonAge -eq "1") { $Reply += " since yesterday"
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} else { $Reply += ", last new moon was $MoonAge days ago"
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}
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& "$PSScriptRoot/give-reply.ps1" "$Reply"
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exit 0 # success
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} catch {
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"⚠️ Error: $($Error[0]) ($($MyInvocation.MyCommand.Name):$($_.InvocationInfo.ScriptLineNumber))"
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exit 1
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}
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