• Pixel-art Epochra, the Precession Navigator, on a black mug with the slogan "WRONG EPOCH. WRONG SKY."

IndexCatalogueMug

Epochra, the Precession Navigator Mug

\[p_A \approx 5028.796195''\ \text{per Julian century} \approx 50.3''\,\text{yr}^{-1}\]
$21.99 USD
$21.99 USD
特價 售罄
Size

General precession in longitude is about 50.3″ per year; coordinates must specify the epoch (J2000).

The joke: Pointing at old coordinates. The slogan on the mug reads WRONG EPOCH. WRONG SKY.

Source: N. Capitaine et al., A&A 412, 567 (2003).

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

General precession in longitude is about 50.3″ per year; coordinates must specify the epoch (J2000).

The joke: Pointing at old coordinates. The slogan on the mug reads WRONG EPOCH. WRONG SKY.

Source: N. Capitaine et al., A&A 412, 567 (2003).

Equations

\[p_A \approx 5028.796195''\ \text{per Julian century} \approx 50.3''\,\text{yr}^{-1}\]
\[P = \frac{360^\circ}{p_A} \approx 25\,800\ \text{yr}\]
SymbolMeaningUnit
\(p_A\) general precession in longitude —
\(P\) precession period \(\mathrm{yr}\)

Sources

  1. N. Capitaine et al., A&A 412, 567 (2003)

Field notes

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