IERS Bulletin A Combined Polar Motion and UT1, Observed, 1973 to 2026
cra:polar-motion-bulletin-a-1973-202619,554 records10 columnsv1.0 · issued 2026-07-21
01Description
The rapid-service combined Earth orientation solution (Bulletin A, finals2000A) restricted to observed epochs: polar motion, UT1-UTC, and excess length of day with formal uncertainties. This is the operational series used for near-real-time rotation monitoring; prediction rows are excluded so every record in this file is a measurement.
02Package Contents
| Data file (CSV) | The cleaned series, one record per row |
| README.md | Source, terms, exact cleaning steps, column definitions, limitations, citation |
| Preparation script | Reproduces the CSV mechanically from the named source file(s) |
| CHECKSUMS.txt | SHA-256 for every file in the package |
Dataset Recordcra:polar-motion-bulletin-a-1973-2026
Series
Earth Orientation
Coverage
1973-01-02 to 2026-07-16, observed epochs only
Resolution
Daily
Extent
19,554 records × 10 columns
Version
v1.0 · issued 2026-07-21
Source
IERS Bulletin A (finals2000A), USNO
Package
cra_polar_motion_bulletin_a_1973_2026_v1.0.zip · 542 KB
Data file SHA-256
a2b103a66be4edb343aa7ab36b6a2363398b59ccd83408e3b3e47668461d4b4c
03Delivery
Resolving member access.