• Pixel-art Lunelock, the Tidally Locked Speaker, on a black mug with the slogan "TIDALLY LOCKED TO THE SLIDES."

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Lunelock, the Tidally Locked Speaker Mug

\[P_{\text{rot}} = P_{\text{orb}}\]
$21.99 USD
$21.99 USD
Promotion Épuisé
Size

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.

Delivery times & where we ship

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.

Full refund & replacement policy

The physics

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).

Equations

\[P_{\text{rot}} = P_{\text{orb}}\]
SymbolMeaningUnit
\(P_{\text{rot}}\) rotation period of the satellite \(\mathrm{s}\)
\(P_{\text{orb}}\) orbital period \(\mathrm{s}\)

Sources

  1. S. J. Peale, "Rotation histories of the natural satellites," in Planetary Satellites, ed. J. A. Burns (Univ. Arizona Press, 1977), pp. 87–112
  2. B. Gladman et al., Icarus 122, 166 (1996)

Field notes

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