Re: Summer Solstice in Florence

Hello Claus, Yes, in J. L. Heilbron's "The Sun in the Church" he reports that Toscanelli designed the original meridian and solstice mark in 1510, placing a bronze plaque at the sun's noon solstice image. Around 1754 Leonardo Ximenes discovered that Toscanelli's 1510 meridian was off by almost a

Re: Summer Solstice in Florence

On Thu, Jun 7, 2018 at 3:19 PM, Willy Leenders wrote: > Hi Bill, > > My answers on your questions are: > > 1. > The light spot moves from the west to the east and the camera observes > this from a position north of that displacement. > I agree. -Bill > > 2. > The image of a circle projected by

Sv: Summer Solstice in Florence

The divided line or band to the left in the picture is Leonardo Ximenes’ so-called new meridian line described in his 1757 book Del vecchio e nuovo gnomone fiorentino. It deviates slightly from the old meridian line, dating from ca. 1475,

Re: Summer Solstice in Florence

Hi Bill, My answers on your questions are: 1. The light spot moves from the west to the east and the camera observes this from a position north of that displacement 2. The image of a circle projected by the sun is only a circle in an exceptional case. In all other cases it is an ellipse. 3.

Re: Summer Solstice in Florence

Thought provoking video. Here are a two simple questions worth contemplating: 1. From what perspective is the video filmed?Is the camera roughly south, north, east,or west of the summer solstice mark? 2. Why does the sun appear elongated in its right-to-left direction of travel across the

RE: Summer Solstice in Florence

Thanks for the link, Jim! A lovely spectacle. On the slightly negative side, it never ceases to amaze (or amuse) me, the number of idiots that take flash photos of scenes of light. Same with the thousands of puny firefly flickers in the stadiums, serving only to light up the heads of the

Summer Solstice in Florence

Hello All, This morning I saw an article online about the upcoming summer solstice that may be of interest: https://www.thelocal.it/20180606/florence-duomo-gnomon-summer-solstice Get your sundial prototypes ready to test, it won't be long before the special moment comes! ⁣Best, Jim Tallman