Orientation Watch Dual-Speed Indicators Hemisphere Navigation
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Solution Overview
Problem
Existing compass watches are limited in determining the direction of north in the Southern Hemisphere, as they are designed for the Northern Hemisphere's solar trajectory, and require manual adjustments for civil and solar time discrepancies.
Innovation Solution
A watch movement with indicators that rotate at different speeds to account for the sun's path in both hemispheres, featuring a solar time indicator and cardinal point indicators that adjust for phase differences between civil and solar time, allowing accurate determination of north in either hemisphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional needle watch is used to determine north by aligning the hour hand with the sun, then the method is simple and quick, but the accuracy is reduced due to the offset between civil time and solar time
Solution Approach 1:
The watch face is segmented into multiple functional zones: a first indicator zone for civil time, a second indicator zone for solar time, and a third indicator zone for cardinal directions. This segmentation allows each zone to handle specific time systems independently, resolving the contradiction between simplicity and accuracy by providing both civil time reading and solar time-based navigation functionality without requiring the user to manually convert between time systems.
Solution Approach 2:
The patent introduces solar time as an intermediary between civil time and the sun's position. The solar time indicator acts as a mediator that accounts for the equation of time and time zone offsets, allowing the user to directly align the solar time indicator with the sun to determine cardinal directions accurately, while the civil time indicator continues to display standard watch time for daily activities.
2Reliability
If the watch is designed for Northern Hemisphere navigation, then the mechanism works accurately in the north, but it cannot be used in the Southern Hemisphere without modification
Solution Approach 1:
The watch is designed with universal functionality to operate in both Northern and Southern Hemispheres. The third indicator zone for cardinal directions and the solar time indicator can be used in either hemisphere, with the user simply needing to identify whether they are in the northern or southern hemisphere to correctly interpret the cardinal direction indications. This multi-functionality eliminates the need for separate watch designs for different hemispheres.
Solution Approach 2:
The patent incorporates dynamic adaptability through the solar time indicator that automatically adjusts for the sun's position relative to the observer's location. The mechanism dynamically accounts for the sun's trajectory differences between hemispheres, allowing accurate cardinal direction determination regardless of whether the observer is in the northern or southern hemisphere, thus providing hemisphere-independent reliability.
3Measurement precision
If manual time adjustment is required to account for civil and solar time differences, then the watch can indicate solar time, but the ease of operation is reduced due to additional user actions needed
Solution Approach 1:
The watch performs preliminary action by automatically establishing the relationship between civil time and solar time through its mechanical design. The solar time indicator and cardinal direction indicator are pre-configured to reflect the equation of time and time zone offsets without requiring manual intervention. The user simply needs to read the indicators directly, eliminating the need for manual time conversion or adjustment while maintaining accurate solar time indication.
Data Source
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AI summary
Orientation watch comprising a first indicator to show the direction of one of the cardinal points when the watch is in the Southern Hemisphere, and a second indicator rotating less rapidly to show the direction of one of the cardinal points when the watch is in the Northern Hemisphere.