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In the past, the sun, moon and earth were the only elements to measure time. This progression is in fact what time is; What’s left of the day before the sun goes down, what’s left of the night before a new day begins. Here we find the origin of time. These basic values are displayed at a glance on Harrie Sijbers
‘Sunwatch’ concept.


The day circle

Day and Nighttime

Day / night ratio

day circle in summertime

out of range warning

sun in daytime