HELIOS Subsolaris Sundial
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Named after its unique function, the representation of the Sun’s path across the globe, HELIOS Subsolaris displays the exact Central European time (CET/CEST) and the date.
The movement of the Earth in its ecliptic path around the Sun and around its own axis is the gigantic cosmic clockwork which powers the sundial - accurate and consistent. The clock’s hand is the sunlight, which is coming from a different direction at any moment in time. The rays of light meet the sundial’s mirror and project the image of the Sun as point of light on the screen. In the example, the Sun’s image displays the sub-solar in the Sahel at 13.30 hours CEST on 15 August. The zenith position, daily migration, seasons, solstice, equinox - the Sun itself makes these natural phenomena visible on the HELIOS sundial.
The sundial is clearly superior to the quartz clock in its continuous accuracy. The deviation of a quartz clock may be up to ±1 second per week, in a year it may be almost a whole minute too fast or too slow. The HELIOS sundial is absolutely accurate for the first year and even in 100 years will only deviate by a maximum of ±30 seconds.
Documents and links
Product information HELIOS Subsolaris sundial.