The day
Calendar Round
Outer ring: the Haab' (18 months of 20 days + 5 Wayeb days). Inner ring: the 20 Tzolk'in day names, paired with a number 1–13. The pair repeats every 18,980 days.
The sky that day
Top-down view of the ecliptic, 0° (March equinox) to the right. Radius is log-scaled so Mercury and Saturn both fit. The Moon is drawn near Earth, not to scale.
Where each body is in its cycle
Bar = fraction of the synodic cycle since conjunction (new moon for the Moon), shown against the cycle length in the Maya almanacs. Step by 584 days to watch Venus return to the same place.