<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[Dioptra]]></title><description><![CDATA[<p dir="auto">An optical instrument, invented by Hipparchus, for taking<br />
<a href="/topic/214182/altitudes">altitudes</a>, leveling, etc.</p>
]]></description><link>https://definedictionarymeaning.com/topic/51004/dioptra</link><generator>RSS for Node</generator><lastBuildDate>Tue, 23 Jun 2026 16:36:20 GMT</lastBuildDate><atom:link href="https://definedictionarymeaning.com/topic/51004.rss" rel="self" type="application/rss+xml"/><pubDate>Tue, 02 May 2017 05:24:15 GMT</pubDate><ttl>60</ttl></channel></rss>