The Heuer Solunagraph’s small register at about 9 o’clock indicates tides; it is not a documented sunlight-exposure display. Set it against a known local high-tide time, then treat its rotating indication as a watch display—not a substitute for current local tide information.
What does the 9 o’clock dial show?
On the Orvis-retailed Heuer chronograph known as the Solunagraph, the register at approximately 9 o’clock is a tide indicator. The name can be confusing: sources discussing the watch describe a tide register, not an instrument that measures sunlight exposure. For naming context, see OnTheDash’s history of Solunagraph, Seafarer and Mareographe naming and the Sotheby’s catalogue entry for a Solunagraph example.
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How to set and read the tide indicator
- Find a reliable local high-tide time. Use a tide time for the relevant location and date; the register needs a known high tide as its reference point.
- Use the tide-setting pusher. Set the tide indication to align with that known high-tide time. The control and exact setting details can differ by execution, so identify the particular watch and consult its documentation where available.
- Read subsequent indications as the register turns. The tide cycle repeats, allowing the register to indicate later high and low tides. For actual planning, verify times against a current local tide table rather than relying on the watch alone. Analog:Shift describes the tide register and its setting concept in its Heuer Solunagraph listing.
Why markings and controls can differ
Solunagraph examples are not visually identical. Documented executions differ in hands, bezel type and scale, and tide-register markings; one later version is described with wave lines on the tide dial. OnTheDash’s Solunagraph (Orvis) reference discusses early and later executions, including minute/hour and tachymeter bezel variations. Sotheby’s catalogue describes a circa-1970 stainless-steel reference 2446 SF example. These are descriptions of examples, not a complete authentication standard.
When identifying or comparing a watch, record its reference and execution, register markings and hands, bezel type and scale, condition and legibility, and any available documentation. Do not assume a marking or pusher arrangement from one example applies to every Solunagraph.
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Can the Solunagraph replace a tide table?
No. The register provides a watch indication based on the high-tide time used to set it. The cited descriptions do not establish that it supplies location-specific, current tide data or accounts for local conditions. Check a current tide source for the place and date before making decisions near the water.
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