Word origin · etymology
Initialism of three researchers' surnames.
GMT stands for Goodman–Martínez–Thompson: Joseph Goodman, Juan Martínez-Hernández, and J. Eric S. Thompson. Here it does not mean Greenwich Mean Time.
UC Santa Barbara: the Goodman–Martínez–Thompson correlation name ↗
How we know · epistemology
Chronological alignment convention
A correlation constant links the Long Count to Julian day numbering. This implementation declares 584283; differing correlation choices shift converted dates, so agreement on the count alone is insufficient when comparing historical chronologies.
Connected concepts
Terms used in this explanation
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.