Traditionally, a Santali lunar month is counted from the first crescent moon (ᱢᱩᱞᱩᱜ ᱮᱛᱚᱦᱚᱵ) to Uwas (ᱩᱶᱟᱹᱥ). It tracks the moon's journey across these distinct days (Amis), divided into two clear phases:
ᱢᱩᱞᱩᱜ ᱠᱷᱮᱬ (Waxing Half)
Day 1 to 15
From the first crescent (ᱢᱩᱞᱩᱜ ᱮᱛᱚᱦᱚᱵ) to the glorious full moon (ᱠᱩᱱᱟᱹᱢᱤ).
ᱵᱟᱸᱫᱳ ᱠᱷᱮᱬ (Waning Half)
Day 16 to 30
From the waning phases transitioning down to the dark new moon (ᱟᱢᱟᱵᱟᱹᱥᱤ).