Git commit 8294000cc8d6ae94e3c5ce2f4b9d01000581c194 by Yuri Chornoivan. Committed on 16/01/2023 at 11:28. Pushed by yurchor into branch 'master'.
Fix minor typos M +5 -5 doc/ekos-align.docbook https://invent.kde.org/education/kstars/commit/8294000cc8d6ae94e3c5ce2f4b9d01000581c194 diff --git a/doc/ekos-align.docbook b/doc/ekos-align.docbook index 94a506d0d..f2941416b 100644 --- a/doc/ekos-align.docbook +++ b/doc/ekos-align.docbook @@ -554,7 +554,7 @@ However, unless you have a top of the line mount, then you'd probably want to use an autoguider to keep the same star locked in the same position over time. Despite all of this, if the axis of the mount is not properly aligned with the celestial pole, then even a mechanically-perfect mount would lose tracking with time. Tracking errors are proportional to the magnitude of the misalignment. It is therefore very important for long exposure imaging to get the mount polar aligned to reduce any residual errors as it spans across the sky. </para> <para> - Before starting the process, point the mount as close as possible to the celestial pole with the counterweights down. If you are living in the Northern Hemisphere, point it as close as possible to Polaris. If Polaris is not visible (e.g. blocked by trees or buildings) you may point elsewhere, preferably near the Meridian. Make sure there is at 30-60 degrees of sky viewable in an arc East or West of the Meridian from the position you choose. Select the direction of free sky, the number of degrees for each of two slews, the mount slew speed, and whether the mount will be slewing automatically (recommended) or manually. + Before starting the process, point the mount as close as possible to the celestial pole with the counterweights down. If you are living in the Northern Hemisphere, point it as close as possible to Polaris. If Polaris is not visible (⪚ blocked by trees or buildings) you may point elsewhere, preferably near the Meridian. Make sure there is at least 30-60 degrees of sky viewable in an arc East or West of the Meridian from the position you choose. Select the direction of free sky, the number of degrees for each of two slews, the mount slew speed, and whether the mount will be slewing automatically (recommended) or manually. </para> <para> The tool works by capturing and solving three images. After capturing each, the mount rotates by the fixed amount you entered and another image is captured and solved. If you chose manual, you will need to slew the mount by roughly the angle chosen. @@ -593,13 +593,13 @@ </mediaobject> </screenshot> <para> - If your error is low enough (e.g. less than an arc-minute) then you don't need to make any adjustments. Simply press stop and you're done. + If your error is low enough (⪚ less than an arc-minute) then you don't need to make any adjustments. Simply press stop and you're done. </para> <para> - If you will be making corrections to your mount's axis, you should select the adjustment approach (we're using Plate Solve in this example), and how often the system should recapture images to re-measure the polar alignment error. The refresh interval should be frequent, but it doesn't make sense to make it faster that your CPU can capture and plate-solve the images. We're using 2s in this example. Then press the Refresh button to begin the correction process. + If you will be making corrections to your mount's axis, you should select the adjustment approach (we're using Plate Solve in this example), and how often the system should recapture images to re-measure the polar alignment error. The refresh interval should be frequent, but it doesn't make sense to make it faster that your CPU can capture and plate-solve the images. We're using 2s in this example. Then press the <guibutton>Refresh</guibutton> button to begin the correction process. </para> <para> - The system will capture images, and re-estimate the polar alignment error after each image. You can try to reduce the error by adjusting the Alititude and Azimuth correction knobs on your mount. The image below shows the screen after the altitude error has been almost zeroed. See the difference between the <emphasis>Measured Error</emphasis> row, which shows the originally measured error after the original 3 captures, and the <emphasis>Updated Error</emphasis> row which shows the current error estimate. + The system will capture images, and re-estimate the polar alignment error after each image. You can try to reduce the error by adjusting the Altitude and Azimuth correction knobs on your mount. The image below shows the screen after the altitude error has been almost zeroed. See the difference between the <emphasis>Measured Error</emphasis> row, which shows the originally measured error after the original 3 captures, and the <emphasis>Updated Error</emphasis> row which shows the current error estimate. </para> <screenshot> <screeninfo> @@ -635,7 +635,7 @@ <title>Move Star Correction Scheme</title> <para> - We also have an alternative schemes for correcting polar alignment. Two variations are <emphasis>Move Star & Calc Error</emphasis> and <emphasis>Move Star</emphasis>. When you select this scheme, the system place a yellow/green/violet triangle on the screen. The trangle can be moved by clicking near a star, and the yellow/violet corner is moved to that star. In this scheme the user corrects polar alignment by first adjusting the mount's azimuth knob so that the selected star moves along the yellow side of the triangle. Once the star is near the next vertex, the azimuth knob should be adjusted so that the star moves along the green side of the triangle. Once the star is moved to the green/violet vertex, the mount is polar aligned, and the user can click <emphasis>stop</emphasis>. + We also have an alternative schemes for correcting polar alignment. Two variations are <emphasis>Move Star & Calc Error</emphasis> and <emphasis>Move Star</emphasis>. When you select this scheme, the system place a yellow/green/violet triangle on the screen. The triangle can be moved by clicking near a star, and the yellow/violet corner is moved to that star. In this scheme the user corrects polar alignment by first adjusting the mount's azimuth knob so that the selected star moves along the yellow side of the triangle. Once the star is near the next vertex, the azimuth knob should be adjusted so that the star moves along the green side of the triangle. Once the star is moved to the green/violet vertex, the mount is polar aligned, and the user can click <emphasis>stop</emphasis>. </para> <para> The difference between <emphasis>Move Star & Calc Error</emphasis> and <emphasis>Move Star</emphasis> is that in the former, the system attempts to track the star the user has selected, and places a circle around that star. In that scheme it also attempts to update the <emphasis>Updated Err</emphasis> row. If the star tracking isn't reliable, simply ignore it or use the <emphasis> Move Star </emphasis>scheme and move the star by-eye until it's close to the final target. An example of using this technique is shown in this video:
