<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31345381</termId><termName>sextants</termName><termType>PT</termType><termNote><![CDATA[ Astronomical instruments used for measuring angular distances, especially the altitude of celestial bodies, in order to determine the longitude and latitude of ships at sea. ]]></termNote><termCreatedDate>2026-03-30 20:33:09</termCreatedDate><relation><relationType>UF</relationType><termId>31345382</termId><termName>sextant</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31398114</termId><termName>vertical angle measuring devices</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31383815</termId><termName>astronomical instruments</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31320959</termId><termName>navigational instruments</termName><termType>PT</termType></relation></term>  </Zthes>