{"title":"Daily Mayan energy reading","fields":[{"key":"date","name":"date","inQuery":true,"kind":"date","required":false,"description":"Date in YYYY-MM-DD format, in the PROLEPTIC GREGORIAN calendar, extended backwards unchanged through the 1582 reform. Years 1 to 4000 are accepted. A reference converter that switches to the Julian calendar below the reform will disagree with a date before 15 October 1582 by ten or eleven days; that is a difference of input convention rather than of arithmetic, and passing the Julian equivalent to such a tool reproduces these values exactly. A single-digit month or day is accepted and zero padded. Defaults to the current day in UTC.","example":"2026-09-02"},{"key":"correlation","name":"correlation","inQuery":true,"kind":"tiles","required":false,"description":"Which correlation constant ties the day count to a civil date. This is the single choice that shifts every value in the response, so it is a parameter rather than a hidden default, and the resolved value comes back under conventions. \"gmt-584283\" is the commonly accepted constant and the default, and it is the one the major institutional converter runs on. \"martinez-hernandez-584281\" sits two days earlier, \"astronomical-584285\" two days later, and \"martin-skidmore-584286\" three days later, each shifting the Long Count by exactly its difference in days. Four of the eight published constants are offered: the other four sit tens of thousands of days away and are of historical interest only. The 584281 constant is the Martínez Hernández correlation, after Juan Martínez Hernández.","enum":["gmt-584283","martinez-hernandez-584281","astronomical-584285","martin-skidmore-584286"],"default":"gmt-584283","example":"gmt-584283","fold":true}],"hasLang":true,"groups":[{}],"opensOnLoad":true}