Talk:Total penumbral lunar eclipse

Tetrad
Is the term 'tetrad' fully explained? "A series of four total lunar eclipses in a row is called a tetrad. "  I was looking for a WP article on 'Tetrad' and don't see one. — Charles Edwin Shipp (talk) 21:14, 14 April 2014 (UTC)


 * Look under the second graphic (on frequency) and you will find, "A tetrad is a set of 4 total umbral eclipses within 2 years." -- AstroU (talk) 21:23, 14 April 2014 (UTC)


 * I agree. An expanded explanation could be added. Give it your input. -- AstroU (talk) 21:32, 14 April 2014 (UTC)


 * There should be a discussion of the tetrad in the article lunar eclipse, but unfortunately there currently is not. That article needs a lot of work. If the lunar eclipse article discussed the tetrad there could be a link to it from the tetrad disambiguation page. (although the page does currently state that a tetrad is a "an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations (semester).") — TimL &bull; talk 21:49, 14 April 2014 (UTC)


 * Agreed, this article is entirely from Meeus's 1980 paper (PDF link:, but no OCR searching), and more information could be taken from the paper at least, on tetrads, whether mixed in here, or in another article or section of lunar eclipse. Tom Ruen (talk) 22:16, 14 April 2014 (UTC)


 * I added a quick tetrad list from existing templates, 1951-2050. Tom Ruen (talk) 23:36, 19 April 2014 (UTC)

Frequency and Saros Table
I have overhauled the frequency section and added a total penumbral eclipse/Saros table based on a chart and Fred's eclipse canon. Any other help and suggestions will be appreciated. EclipseDude (talk) 23:59, 8 September 2018 (UTC)

Frequency
In the Frequency section it's stated that the total penumbral eclipses are very rare; and there was no such eclipse between 2006 and 2053. But in the List of lunar eclipses in the 21st century there are so many penumbral eclipses between the two mentioned years.

Is the frequencies of penumbral eclipses wrong here? Or are the penumbral eclipses in that article mixed (partial and total) and need to be separated from each other to prevent such disambiguations? Aminabzz (talk) 21:04, 20 October 2022 (UTC)