<story><title>Earth&apos;s rotation, with the camera locked to the sky instead of the ground</title><url>https://mastodon.social/@coreyspowell/110531182569820738</url></story><parent_chain><item><author>Freebytes</author><text>How is this actually accomplished, though?</text></item><item><author>mytailorisrich</author><text>Straight to the source:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;artuniverse.eu&amp;#x2F;gallery&amp;#x2F;190705-rotation24h&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;artuniverse.eu&amp;#x2F;gallery&amp;#x2F;190705-rotation24h&lt;/a&gt;</text></item></parent_chain><comment><author>shagie</author><text>&lt;p&gt;&lt;pre&gt;&lt;code&gt;    Mount Sky-Watcher Star Adventurer
    Tripod Manfrotto MT055XPRO3
&lt;/code&gt;&lt;/pre&gt;
The tripod is a good, heavy, stable one.  &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.manfrotto.com&amp;#x2F;us-en&amp;#x2F;055-aluminum-3-section-tripod-with-horizontal-column-mt055xpro3&amp;#x2F;&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.manfrotto.com&amp;#x2F;us-en&amp;#x2F;055-aluminum-3-section-tripo...&lt;/a&gt;&lt;p&gt;The head is &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.skywatcherusa.com&amp;#x2F;collections&amp;#x2F;star-adventurer&amp;#x2F;products&amp;#x2F;star-adventurer-pro-pack&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.skywatcherusa.com&amp;#x2F;collections&amp;#x2F;star-adventurer&amp;#x2F;pr...&lt;/a&gt; which is a bit more fancy than the old school equatorial mounts.... but&lt;p&gt;&lt;pre&gt;&lt;code&gt;    Star Adventurer 2i multi-function equatorial tracking mount with built-in Wi-Fi control
&lt;/code&gt;&lt;/pre&gt;
It&amp;#x27;s still an equatorial mount.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;astrobackyard.com&amp;#x2F;equatorial-telescope-mount&amp;#x2F;&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;astrobackyard.com&amp;#x2F;equatorial-telescope-mount&amp;#x2F;&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Equatorial_mount&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Equatorial_mount&lt;/a&gt;&lt;p&gt;You adjust the base to the latitude that you are at so that the mount can rotate to match the Earth&amp;#x27;s rotation on one axis, and then the other axises can track ascension and declination - which remain constant in the sky.&lt;p&gt;This differs from the altazimuth mount ( &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Altazimuth_mount&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Altazimuth_mount&lt;/a&gt; ) where a celestial object is that that location now, but moves.&lt;p&gt;Sirius is at 06h 45m 08s RA and -16° 42’ 57”... but as I type this, as seen from Greenwich, United Kingdom it would be at -27.4° altitude (below the horizon), 277.5° azimuth - and that coordinate system moves.</text></comment>
<story><title>Earth&apos;s rotation, with the camera locked to the sky instead of the ground</title><url>https://mastodon.social/@coreyspowell/110531182569820738</url></story><parent_chain><item><author>Freebytes</author><text>How is this actually accomplished, though?</text></item><item><author>mytailorisrich</author><text>Straight to the source:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;artuniverse.eu&amp;#x2F;gallery&amp;#x2F;190705-rotation24h&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;artuniverse.eu&amp;#x2F;gallery&amp;#x2F;190705-rotation24h&lt;/a&gt;</text></item></parent_chain><comment><author>taejo</author><text>An equatorial mount keeps the camera pointing in a fixed celestial direction by rotating at the same rate as the Earth in the plane of the equator. It&amp;#x27;s essential for any long exposure of the sky where you don&amp;#x27;t want star trails, the unusual thing here is having the horizon in frame.</text></comment>