Wanted to provide a few more details.
The advanced parameters for the current weather conditions are as follows:
[ar]160[/ar]
[as]$60+((120/((#ASH#+(#ASmm#/60))(#ARH#+(#ARmm#/60))))*(#DH##ARH#)))$[/as]
This essentially determines how many hours (in decimals) there will be in the day, which is used to determine how many steps will be necessary to show the sun's arc over 120 degrees. This is then multiplied by the number of hours that have past since sunrise, and sets sunrise at 60 degrees (or the left horizon).
The truly troubling one was setting the Moon's arc, specifically because it is more complicated. This is because the moon can rise and set at vastly different times, the most problematic being when the moon rises before midnight and sets after; this breaks the math I used for the sun, as sunset hour ends up being less than sunrise hour at these times.
The advanced parameters I used for the moon are as follows:
[ar]160[/ar]
[as]$#AMSH#<#AMRH#&&#DH#>#AMRH#?(60+((120/((24+#AMSH#+(#AMSmm#/60))(#AMRH#+(#AMRmm#/60))))*(#DH##AMRH#)))$
$#AMSH#<#AMRH#&&#DH#<#AMRH#?((120/((24+#AMSH#+(#AMSmm#/60))(#AMRH#+(#AMRmm#/60))))*(#DH#))$
$#AMSH#>#AMRH#?(60+((120/((#AMSH#+(#AMSmm#/60))(#AMRH#+(#AMRmm#/60))))*(#DH##AMRH#)))$[/as]
This one is much more complicated, but essentially considers three conditions 
1) Will the sunset be earlier than the sunrise, and is the current time greater than sunrise? If these are true, this tells me that the moon will cross the midnight threshold, but has not yet done so. What follows is a formula similar to the current conditions arc, but adds 24 to #AMSH# to accurately determine how many hours the moon will be in the sky.
2) Will the sunset be earlier than the sunrise, and is the current time less than sunrise? If these are true, this tells me the moon has already crossed the midnight threshold. The previous formula is used, although arc origin is not moved 60 degrees, and the current hour is used to determine location on the arc (#AMRH# is not subtracted from it).
3) Will sunset be later than sunrise? If true, the moon will not cross the midnight threshold and my formula is largely unchanged from that which governs the current weather condition arc.
(hopefully someone finds all of this useful. If there is anything incorrect about this, please let me know)
