親子觀星會

http://www.sharpcap.co.uk/sharpcap/polar-alignment
PhotoPolarAlign 跟電子極望是類似嗎?
https://github.com/ThemosTsikas/PhotoPolarAlign

http://www.considine.net/aplanatic/align.htm

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先前QHY  電子極望

http://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=24855.0

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How to Polar Align Easily: PHD2 Drift Alignment
電子飄移 
http://photographingspace.com/polar-align-phd2/

(http://photographingspace.com/wp-content/uploads/2016/01/guiding-setup.jpg)