<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31309820</termId><termName>mean solar time</termName><termType>PT</termType><termNote><![CDATA[ Time that is kept by most clocks and watches and keyed to timezones; that is, the solar time that would be measured by observation if the Sun traveled at a uniform apparent speed throughout the year rather than, as it actually does, at a slightly varying apparent speed that depends on the seasons. ]]></termNote><termCreatedDate>2026-03-30 20:23:27</termCreatedDate><relation><relationType>UF</relationType><termId>31309821</termId><termName>time, mean solar</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31300316</termId><termName>solar time</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31309817</termId><termName>apparent solar time</termName><termType>PT</termType></relation></term>  </Zthes>