Elements of the Celestial Sphere: Fine Jersey Long Sleeve T-Shirt in Navy


1527. The Horizon System of Coordinates

Made in collaboration with and also available at GCaptain.com.

Experience navigators will know that this shirt is straight out of Bowditch!

For those still learning how to manipulate a sextant, the Horizon System of Coordinates is a system based upon the celestial horizon as the primary great circle and a series of secondary vertical circles which are great circles through the zenith and nadir of the observer and hence perpendicular to his horizon. It is used by blue water navigators to locate a ship's position upon the ocean. 

Every artisan crafted IronTree Clothing t-shirt features unique graphics, hand-printed on the highest quality t-shirts. We choose only the finest materials in the creation of our line, using water-based inks and fabrics with a butter-soft hand. The result is an original t-shirt that looks and feels like your favorite old tee with aged graphics, straight of the package.

Unisex Sizing:
- For Men, Sizing is Fitted.
- For Women, Sizing is Regular Fit

- 100% Fine Ring-Spun Cotton, 4.2 oz.
- Hand-Finished in the good ol' USA, Sweatshop Free!

For more Sizing info, check the T-Shirt Measurement & Size Charts in the product photos above.

All Images Copyright 2018 by IronTree Brand Clothing. All Rights Reserved.

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