Beijing 1990: historical daylight saving applies

China observed daylight saving time from 1986 to 1991. If you were born in a Chinese city during one of those summers, the clock time written on your record is probably an hour ahead of the standard time your chart should be built from. This case is a synthetic summer record from that window, and it is also the fixed example chart used elsewhere on this site.

The correction here is large. Starting from a noon clock reading, the historical UTC offset plus the daylight-saving component plus the longitude difference from the 120°E reference meridian plus the Equation of Time together move the true solar time to 10:45. That is seventy-four minutes of movement, which is more than an hour pillar in the wrong direction.

This is the single most consequential timezone fact for readers born in China in the late 1980s. A chart built from the raw clock reading will place an hour pillar that the corrected time does not support. The same record, run through the correction, may land in a different two-hour branch entirely.

Because this is also the chart we use on the sample-report page and in the Learn guides, you can follow the same four pillars through several different presentations on this site. That is useful if you want to see how a correction receipt, a chart display, and a written reading relate to one another before entering your own data. The chart is invented rather than drawn from any person's record, and the same four pillars appear here as a pinned test case so the example cannot silently drift.