सिद्धान्तदर्पण (महामहोपाध्याय सामन्त चन्द्रशेखर सिंह - नग्न-नेत्र खगोल वेध एवं गणित महाकोश)

..."?
Wait, could it be "कलेर्वृत्ततः"? (from the elapsed of Kali?)
"कलेः वृत्ततः" -> कलेर्वृत्ततः! वृत्त means elapsed/past (बीते)!
Look at the Hindi: "कलियुग आरम्भ से अहर्गण निकालने के लिए... (श्लोक ४९)..."
Wait, why would it be वृत्ततः?
Wait, in "कलेर्वृत्ततः", does it have ृ? Yes! वृत्त has ृ!
Wait, but what is before ृ? Is it व?
Wait! Look at the letter before ृ:
Is it व, or क?
Wait: क - ले - र् - ?
Could it be: कलेः + वृत्ततः = कलेर्वृत्ततः?
Let's look at the letters:
क (ka)
ले (le)
Then: र् (repha on the next letter).
What is the next letter?
If it is 'वृ', then: व with repha on top and ृ at bottom!
Wait! Can a letter have BOTH repha on top AND ृ at the bottom?
YES! र् + व + ृ = र्वृ (rvṛ)!
Look at it:

• Top: repha (र्)
• Middle: व (va)
• Bottom: ृ (ri-kar)!
  Wait, does it have a middle 'क'?
  Look at the letter in L24:
  Wait!