Archaeoastronomy

Equinox Observations at Atlatl Rock

Valley of Fire State Park, NV, USA

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Fall 2018 & 2017

Spring 2023

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Results of the spring campaign* 2023

from March 24 to April 6, 2023
(3.9 days to 16.9 days after spring equinox)

to document the shadow movement at Atlatl Rock
at
~ 10:45 am PDT and ~ 11:00 am PDT

10:45 PDT days after Equinox: 3.85 days 2023-03-24 17:45 UT	11:00 PDT days after Equinox: 3.86 days 2023-03-24 18:00 UT
10:45 PDT days after Equinox: 4.85 days 2023-03-25 17:45 UT	11:00 PDT days after Equinox: 4.86 days 2023-03-25 18:00 UT
10:45 PDT days after Equinox: 5.85 days 2023-03-26 17:45 UT	11:00 PDT days after Equinox: 5.86 days 2023-03-26 18:00 UT
10:44 PDT days after Equinox: 6.85 days 2023-03-27 17:44 UT	11:00 PDT days after Equinox: 6.86 days 2023-03-27 18:00 UT
10:45 PDT days after Equinox: 7.85 days 2023-03-28 17:45 UT	11:00 PDT days after Equinox: 7.86 days 2023-03-28 18:00 UT
10:45 PDT days after Equinox: 8.85 days 2023-03-29 17:45 UT	10:59 PDT days after Equinox: 8.86 days 2023-03-29 17:59 UT
10:30 PDT days after Equinox: 9.85 days 2023-03-30 17:30 UT	11:15 PDT days after Equinox: 9.86 days 2023-03-30 18:15 UT
10:45 PDT days after Equinox: 10.85 days 2023-03-31 17:45 UT	11:00 PDT days after Equinox: 10.86 days 2023-03-31 18:00 UT
10:45 PDT days after Equinox: 11.85days 2023-04-01 17:45 UT	11:00 PDT days after Equinox: 11.86 days 2023-04-01 18:00 UT
10:45 PDT days after Equinox: 12.85 days 2023-04-02 17:45 UT	11:00 PDT days after Equinox: 12.86 days 2023-04-02 18:00 UT
10:45 PDT days after Equinox: 13.85 days 2023-04-03 17:45 UT	11:00 PDT days after Equinox: 13.86 days 2023-04-03 18:00 UT
10:45 PDT days after Equinox: 14.85 days 2023-04-04 17:45 UT	10:59 PDT days after Equinox: 14.86 days 2023-04-04 17:59 UT
10:45 PDT days after Equinox: 15.85days 2023-04-05 17:45 UT	11:00 PDT days after Equinox: 15.86 days 2023-04-05 18:00 UT
10:45 PDT days after Equinox: 16.85 days 2023-04-06 17:45 UT	10:55 PDT days after Equinox: 16.86 days 2023-04-06 17:55 UT

*: from March 24 until April 6 2023 I documented the shadow at Atlatl Rock each day starting at about 9:00 am PDT until 12:30 pm PDT when the shadow on the petroglyphs was no longer visible as the whole area was in (self) shadow.

It turned out, that the best defined shadow line (in Spring) occured at around 10:45 am PDT when the shadow was very stable and straight.

This observations in spring that cover the time four days to seventeen days after the spring equinox (which was on March 20, 2023 at 02:24 pm PDT) complement the observations made sofar only in fall and demonstrate perfectly the symmetry of events in spring and fall.