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
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.