Was the Moon in Dhanishtha or Shatabhisha? What changes when Abhijit is given a short arc?

This article is available in English, Hindi and Marathi. Using two lunar positions three minutes apart on 10 January 2000, it shows how the same Moon can be assigned to Dhanishtha or Shatabhisha under different boundary rules. It connects the author’s published HV27 results with two historical ways of including Abhijit. Rushikesh Murlidhar Walke set the research direction and proposed the initial hypotheses. Claude (Anthropic) suggested the early comparison of 27 and 28 equal divisions. ChatGPT (OpenAI) assisted with mathematical arguments and internal checks for HV27, and with source checking, writing and translation for this article. The author supplied the computational test reports. Independent human peer review is pending.