Lunelock, the Tidally Locked Speaker Mug
Tidal locking: tidal torque despins a satellite until rotation period equals orbital period, so it always shows the same face (as the Moon does).
The joke: The speaker who never turns from the screen. The slogan on the mug reads TIDALLY LOCKED TO THE SLIDES.
Source: S. J. Peale, "Rotation histories of the natural satellites," in Planetary Satellites, ed. J. A. Burns (Univ. Arizona Press, 1977), pp. 87–112; B. Gladman et al., Icarus 122, 166 (1996).
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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