Data and code release: Ultra-Precise Null Result for Sidereal Clock Anisotropy in 2025 IGS 30-Second Data: Upper Limit < 10−14 s

Public data release accompanying the paper "Ultra-Precise Null Result for Sidereal Clock Anisotropy in 2025 IGS 30-Second Data: Upper Limit < 10−14 s" (Frederick Manfredi, 2025). We analysed batches of five and eight daily rapid clock solutions (DOY 339–346, 2025) from the COD and WUM analysis centres, containing AR-type receiver clock offsets at 30-second cadence. East–West differences were formed after aligning epochs to the nearest 30 seconds. The spurious >10¹³ σ signal appears only when combining data from multiple days due to coherent common-mode drift in the IGS time scale. When analyzed separately, each subset yields a clean null result — confirming the artifactual origin of the large signal. Files: - 2025_ground_clocks.csv : Processed 1D 30s data. Only first 5 files of ground station data here, for more update SEMI_DIRAC_2025_IGS.py - SEMI_DIRAC_2025_IGS.py : Run this script to download All 1D 2025 IGS Data - semi_dirac_gps_sideral_stack.py : Run this script vary the comment to 5 or 8 → reproduces the figures - null_5files.png : 0 sigma Publication-ready figure - spurious_8files.png : spurious sigma Publication-ready figure- CLK 30S 1D files : Pulled from ftp://igs.ign.fr/pub/igs/products/2395/本公开数据集配套论文《2025年国际GNSS服务（IGS）30秒数据中恒星钟各向异性的超高精度零结果：上限<10⁻¹⁴秒》（Frederick Manfredi，2025）。 本研究针对来自COD与WUM分析中心的2025年年积日339至346的单日快速钟解算结果的5组与8组批次开展分析，数据包含30秒采样间隔的AR型接收机钟偏移量。 在将历元对齐至最近的30秒时刻后，计算得到东西向差值序列。 仅当合并多日数据时，会因IGS时间尺度中的相干共模漂移出现虚假的>10¹³σ信号；若对每个子集单独分析，则可得到干净的零结果，从而证实该强信号的人为起源。 附带文件： - 2025_ground_clocks.csv：已处理的一维30秒数据，此处仅提供前5组地面站数据，如需获取完整更新数据，请参考SEMI_DIRAC_2025_IGS.py - SEMI_DIRAC_2025_IGS.py：运行该脚本可下载全部2025年IGS一维数据 - semi_dirac_gps_sideral_stack.py：运行该脚本，通过修改注释参数为5或8，即可复现相关图表 - null_5files.png：可直接用于发表的零σ结果配图 - spurious_8files.png：可直接用于发表的虚假σ结果配图 - CLK 30S 1D files：数据源自ftp://igs.ign.fr/pub/igs/products/2395/