NavList:

Robert, converting both to UT and DMS, you said that  

     SOLEX predicts 0° 51′ 37.7″ on 12 August at 06:39:00 UT.

     IMCCE predicts 0° 51’ 37.8” on 12 August at 06:39:10 UT.

Lars, using Frank's almanac,

      you got 0° 51’ 38.0” on 12 August at 06:39.06 UT.

My “Astron” gives

      0° 51’ 37.7” on 12 August at 06:39:13 UT.

So, all ducks are in a neat row.

However, when I asked Microsoft’s Copilot AI, and then pressed for a more accurate answer, it differed from the above by 38” and was 61 minutes later, allegedly using JPL. I quote …

“Precise Geocentric Separation: Venus–Jupiter Conjunction, 12 August 2025

For your arcsecond-level comparison, here's the refined data:

🪐 Closest Approach Details

• Date: 12 August 2025
• Time (UT): 07:40 UTC
• Minimum Geocentric Separation: 51 arcminutes 0 arcseconds → Equivalent to 3060 arcseconds
• Right Ascension (both): 06h 59m 30s
• Declination:
  • Venus: +21°48′00″
  • Jupiter: +22°39′00″
• Constellation: Gemini
• Angular distance from Sun: ~35°
• Source ephemeris: DE430 (JPL)”

Very friendly dialogue, but wrong!

BR