https:\/\/doi.org\/10.59332\/jbis-078-02-0034<\/a><\/p>\nThe European Space Agency and the U.S. Office of Science and Technology Policy have announced a need for a standardized \u201cCoordinated Lunar Time\u201d for robotic and human activities on the Moon. Much of the ensuing discussion has focused on the problem of aligning high precision clocks on the Moon with Coordinated Universal Time (UTC), including the relativistic effect of a ~58 \u03bcs\/day divergence between the terrestrial and lunar frames, as important to orbital navigation systems in cislunar space. A separate but so far unresolved issue is the definition of a natural lunar time-keeping system for some human-adapted measure of the Moon\u2019s solar illumination and extreme excursions of surface temperature in step with the 29.53059- day synodic period. Here is reprised a nearly forgotten 1970 proposal by the astronomer Kenneth L. Franklin. His Lunar Time (LT) system combined E.W. Brown\u2019s lunation numbering of repeated lunar phases with a regular division of the synodic period into 30 \u201clunes\u201d each of 0.9843529 terrestrial days, further sub-divided into 24 \u201clunours,\u201d with decimal sub-units replacing sexagesimal minutes and seconds. Explicit expressions are given for conversion between UTC and LT, also the subsolar co-longitude and latitude, as important to the seasonal variation in the polar regions.<\/p>\n
Keywords: <\/b>Space Timing Systems, Lunar Settlement, Space History, Space Medicine<\/p>\n","protected":false},"featured_media":52317,"template":"","meta":[],"pwb-brand":[],"product_brand":[],"product_cat":[56,59,3901],"product_tag":[],"class_list":["post-52315","product","type-product","status-publish","has-post-thumbnail","product_cat-journal-of-the-bis","product_cat-papers","product_cat-2025-papers","first","instock","downloadable","virtual","purchasable","product-type-simple","czr-hentry"],"jetpack_sharing_enabled":true,"brands":[],"_links":{"self":[{"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/product\/52315","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/media\/52317"}],"wp:attachment":[{"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/media?parent=52315"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/pwb-brand?post=52315"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/product_brand?post=52315"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/product_cat?post=52315"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/bis-space.com\/shop\/wp-json\/wp\/v2\/product_tag?post=52315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}