Slithera, the Parallactic Serpent Mug
Atmospheric differential refraction disperses star images vertically; align the slit along the parallactic angle to avoid losing blue light.
The joke: Spectroscopists' oldest lesson. The slogan on the mug reads SLIT ALONG PARALLACTIC OR LOSE THE BLUE.
Source: A. V. Filippenko, PASP 94, 715 (1982).
Shipping calculated at checkout by destinationMade to order, ships in ~10 days
Details
Size & material11oz · 15oz
Black glossy ceramic mug with a C-handle. Lead- and BPA-free.
- 11oz: 0.33 l
- 15oz: 0.44 l
CareDishwasher & microwave safe
Dishwasher safe (top rack) or hand wash. Microwave safe.
ShippingBy destination
Shipping calculated at checkout by destination.
Made to order: about 10 days of production and handling before it ships.
Returns & replacements21 days
Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.
Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.
Field notes
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