Re: Equinox, Full Moon and Easter

Yes, as was mentioned, I too have heard that, for determining Easter, they use March 21 as the equinox date. As for Passover, what I heard was that that used to be part of the Easter calculation, but was dropped by the Catholic Church. ...but that the Eastern Orthodox Church still uses Passover w

Re: Historic sundials

Dan, For your question about sundials to discuss with school students, I would have to adjust my selection depending on the age of the students, but as a general starting point I would probably consider: 1. A merket, the Ancient Egyptian instrument - because although not everyone accepts the

Re: Historic sundials

My selection in my history, culture and region. Maybe Google translation can help to understand my Dutch language. http://www.wijzerweb.be/rubenshuis.html or in French http://www.wijzerweb.be/rubenshuisfr.html http://www.wijzerweb.be/voeren001A.html

AW: Heliodrome

Dear Frank, I am confused. Not so much about the term Heliodrom - which I never heard up to now - but about your sundial design / drawing. Could you please elaborate a little bit about it? Thank you and kind regards Siegfried Siegfried Netzband Hebelstr. 12 75233 Tiefenbronn Tel: 07234 2802 Fa

Dr. Rüter Sundial

I've never seen one of these before. https://www.ebay.de/itm/Original-Dr-Ruter-Sonnenuhr-Berlin-1946-Kompass-Uhr/382722122995 Once you push a button, the dial plate with gnomon seems to rotate by compass so as to align with magnetic north showing both summer time and winter time. I guess small ad

RE: Equinox, Full Moon and Easter

I would like to thank all that responded to my simple question. My intent was to use the Socratic method of “asking and answering questions to stimulate  critical thinking and to draw out ideas and underlying presuppositions.” I learned long ago not to ask a question unless I knew the answer. My

Historic sundials

Hello! If you were to make a presentation addressed mainly to schoolchildren or early college about some important historic sundials, which ones would you choose and why? I would be interested in your shortlist, perhaps a top 5 of historic sundials? Best wishes, Dan Uza -

Re: Equinox, Full Moon and Easter

dear Roger, The computation of Easter is a little bit complex, it follows some canonical rules. There is an astronomical equinox but the canonical equinox is always the march 21. I have notice from the ephemeris that this year the astronomic full moon is on the march 21 (1:43 UT), that is in

Re: Equinox, Full Moon and Easter

Roger, https://www.scientificamerican.com/article/how-the-moon-affects-the-date- of-easter/ This article seems to cover your point. Mike In message , Roger writes I always thought Easter Sunday was on the first Sunday after the first full moon after the spring equinox. This year at my lo