True solar time · By city
True Solar Time in Kuala Lumpur
Auspice ·
吉隆坡 · 真太阳时
In Kuala Lumpur, true solar time runs 27 to 88 minutes behind the clock. Across every clock minute of 1980, 1990, 2000, 2010, 55.2% land in a different BaZi hour pillar once corrected, and 4.6% on a different day pillar.
How often does the hour pillar change in Kuala Lumpur?
| Clock minutes whose hour pillar changes | 55.2% |
| Range across 1980, 1990, 2000, 2010 | 36.5% – 61.5% |
| During daylight saving | no daylight saving |
| Outside daylight saving | 55.2% |
| Share of minutes under daylight saving | 0.0% |
| Clock minutes whose day pillar changes | 4.6% |
| Correction range | −88 … −27 min |
From the 40-city study on the main true-solar-time page: every clock minute of 1980, 1990, 2000, 2010 in the Asia/Kuala_Lumpur time zone at 101.69°E, converted to true solar time. Minutes are weighted equally, so this is a per-minute figure, not a per-birth one. Data: /data/solar-time-study.json (CC BY 4.0).
Why the clock and the sun disagree here
Kuala Lumpur is at 101.69°E; its standard clock follows the 120°E meridian (UTC+8). The earth turns one degree every four minutes, so the longitude part of the correction is −73 minutes, the same every day of the year. The equation of time adds a seasonal swing of roughly −15 to +16 minutes. No daylight saving applied in any of the study years, so outside the equation of time the correction does not move through the year.
Kuala Lumpur's clock since 1940
A chart has to use the clock that was in force on the birth date, not today’s. The table below is read directly from the IANA time-zone database the calculator uses, so it lists exactly the offsets a chart for each period is computed with.
| From | Until | Clock | Longitude part | Note |
|---|---|---|---|---|
| already in use in 1940 | 1 September 1941 | UTC+7:20 | −33 min | — |
| 1 September 1941 | 16 February 1942 | UTC+7:30 | −43 min | — |
| 16 February 1942 | 11 September 1945 | UTC+9 | −133 min | — |
| 11 September 1945 | 1 January 1982 | UTC+7:30 | −43 min | — |
| 1 January 1982 | today | UTC+8 | −73 min | — |
Dates are the local day the clock changed. The longitude part is what the correction would be from longitude alone on that clock.
Worked examples for Kuala Lumpur
Each birth is cast twice by the same engine as the calculator: once on the clock time as written, once corrected to true solar time. Same-day convention for the late Rat hour.
1 March 1978, 10:10
A 10:10 am birth in 1978, on the old UTC+7:30 clock.
| By the clock | By the sun | |
|---|---|---|
| Time | 10:10 | 09:13 |
| Hour pillar | 乙巳 (Snake hour) | 乙巳 (Snake hour) |
| Day pillar | 壬戌 | 壬戌 |
Correction −56 min: daylight saving 0, longitude −43, equation of time −13. The hour pillar stays 乙巳 (Snake hour).
1 March 1998, 10:10
The same morning in 1998, after the switch to UTC+8.
| By the clock | By the sun | |
|---|---|---|
| Time | 10:10 | 08:43 |
| Hour pillar | 乙巳 (Snake hour) | 甲辰 (Dragon hour) |
| Day pillar | 丁未 | 丁未 |
Correction −86 min: daylight saving 0, longitude −73, equation of time −13. The hour pillar changes from 乙巳 (Snake hour) to 甲辰 (Dragon hour).
20 August 2005, 00:40
Twenty to one in the morning: close enough to midnight that the date itself is in play.
| By the clock | By the sun | |
|---|---|---|
| Time | 00:40 | 23:23 (19 August 2005) |
| Hour pillar | 戊子 (Rat hour) | 戊子 (Rat hour) |
| Day pillar | 丙子 | 乙亥 |
Correction −76 min: daylight saving 0, longitude −73, equation of time −3. The hour pillar stays 戊子 (Rat hour). By the sun the birth falls on 19 August 2005, and the day pillar moves from 丙子 to 乙亥.
About the clock in Kuala Lumpur
Kuala Lumpur lies at about 101.7°E, two degrees west of Singapore, on the same UTC+8 clock. That puts the sun's highest point near 13:13 by the clock before the equation of time.
Peninsular Malaysia ran on UTC+7:30 until 31 December 1981. From 1 January 1982 the government put the peninsula on UTC+8 so that it shared one clock with Sabah and Sarawak, which were already on it; Singapore changed the same night. During the Japanese occupation of 1942 to 1945 the clocks were on Tokyo time, UTC+9. The 1982 change explains the spread in the study: 1980, the one reference year on the older clock, is the low end of the range.
Malaysia has no seasonal daylight saving. Towns further up the west coast, such as Ipoh and Penang, are further west again, so the same arithmetic gives them a slightly larger longitude gap than Kuala Lumpur.
To apply all of this to one birth, enter the date, clock time and Kuala Lumpur as the birthplace in the free BaZi calculator. It uses the same historical clock and the same three-part correction, shows the arithmetic, and needs no account. For why the correction exists at all, see true solar time in BaZi; to check whether another calculator applies it, try the three test birth times.
Other cities: true solar time in Singapore, true solar time in Vancouver, true solar time in Toronto, true solar time in New York.