# 1977 Chinese Zodiac: Fire Snake, Years and Compatibility

1977 is the year of the Fire Snake, term 54 of the sixty. Its two new-year lines fall 14 days apart and both land on a Friday: one gap, exactly two weeks.

- Canonical: https://gptbazi.com/blog/1977-chinese-zodiac
- Language: English
- Published: 2026-10-20T11:00:00+08:00
- Updated: 2026-10-20T11:49:35+08:00
- Author: Ziheng — https://gptbazi.com/author/ziheng

> GPTbazi is a personality map for entertainment and self-reflection. It is not medical, legal, financial, or psychological advice, and it is not a prediction of events. Calendar dates and solar-term boundaries are astronomical and official calendar facts, not readings of a person.

## 1977 is 丁巳, the Fire Snake

1977 is written 丁巳 (ding-si): 丁, the fourth of the ten heavenly stems, over 巳, the sixth of the twelve earthly branches. That puts it at term 54 of the sixty. The stem is fire, so the year is a Fire Snake and not a plain one; the animal on its own carries no element, and the word in front of it comes from the stem above. 1976 is a Dragon and 1978 a Horse.

The label repeats every sixty years, which is why 1917 and 2037 are also 丁巳. Nothing about 1977 is unique as a year. What is specific to it is where its two new-year lines fell, and that is what most of this page is about.

## 1977 Compatibility: Six Harmony, Clash and Trine

The year gives one branch and nothing else — 巳 Si, the Snake. The three relations below follow from that branch alone: they hold for every birth whose year branch is 巳, and they do not depend on the month, the day or the hour.

| Relation | Branch | Animal |
| --- | --- | --- |
| Six harmony (六合) | 申 Shen | Monkey |
| Clash (相冲) | 亥 Hai | Pig |
| Three harmony (三合) | 酉 and 丑 | Rooster, Ox |

A chart reads the four branches against each other, not the year branch on its own. [The 144-pair table](/blog/chinese-zodiac-compatibility-chart) has every pair.

## Two Fridays, fourteen days apart

In 1977 Li Chun falls on Friday, 4 February, and Lunar New Year's Day falls on Friday, 18 February. Fourteen days separate them, and fourteen is two whole weeks — so the two boundaries land on the same weekday. That is the whole of the coincidence. It is worth stating plainly, because a shared weekday is easy to read as a shared meaning, and there is none here: the two lines are two conventions, not two signs.

| Year | Li Chun | Lunar New Year | Weekday |
| --- | --- | --- | --- |
| 1958 | 4 February | 18 February | Tuesday |
| 1977 | 4 February | 18 February | Friday |
| 2007 | 4 February | 18 February | Sunday |

Those are the only three years between 1940 and 2030 where the gap is a full fortnight with Li Chun leading, and in each of them the two dates land on one weekday. The weekday itself moves — Tuesday, Friday, Sunday — because it is the calendar's own drift, not a property of the animal.

## Ten years where both lines share a weekday

For the two boundaries to fall on the same weekday, the number of days between them has to be a multiple of seven. Over ninety-one years that happens ten times, and the ten split into three sizes.

Twice the gap is zero: 1943 and 1992, the two years the lines meet on the same day. Four times it is a single week — 1956 and 1975 with Li Chun first, 1979 and 1998 with the festival first. Four times it is two weeks: 1958, 1977 and 2007 with Li Chun first, and 1966 with the festival first. 1977 sits in the last group, one of three.

The other eighty-one years put the two lines on different weekdays, because a gap of four, eleven or sixteen days is not a multiple of seven. That is the ordinary case, and it is why the shared weekday is worth one section rather than a rule.

## What a year's tail costs the next year

Neither convention ends a zodiac year on 31 December. Chart-reading ends it on the day before the next Li Chun; the national standard ends it on the day before the next Lunar New Year. For 1977 those two tails are 3 February 1978 and 6 February 1978.

They sit 3 days apart, and 3 is exactly the gap between 1978's own two lines: Li Chun on 4 February 1978 and the festival on 7 February 1978. That is not a coincidence of the sky. Each tail is pinned one day before the following year's line, so the distance between the tails is the distance between the lines, always, for every year in the table.

So the width of 1977's window and the width of 1978's are not independent numbers. 1977 has fourteen days between its lines and hands 1978 a three-day one. A birth on 3 February 1978 is the last day of 1977 under both conventions; from 4 February 1978 the question belongs to 1978.

## 4 February against 18 February

A zodiac year does not begin on 1 January, and the day it does begin on has no single answer. China's national standard for the calendar, GB/T 33661-2017, drafted by the Purple Mountain Observatory of the Chinese Academy of Sciences, starts the lunar year at the first month, and the animal year shares that reference: the animal changes on Lunar New Year's Day. Chart-reading changes the sexagenary year at Li Chun, the solar term that opens spring.

In 1977 the two lines fall 14 days apart, and this year Li Chun comes first: Li Chun is 4 February and Lunar New Year's Day is 18 February. That means chart-reading changes the animal 14 days before the national standard does.

[Chinese Zodiac Year Boundary](/blog/chinese-zodiac-year-boundary-dates) lists both lines for every year from 1940 to 2030, with the gap in days for each.

## Fifteen days, fourteen of them undecided

15 calendar days in 1977 sit on or between the two lines, and 14 of them are read differently depending on which convention is in play.

| Date in 1977 | Under the national standard | Under chart-reading |
| --- | --- | --- |
| 4 February – 17 February (14 days) | Dragon | Snake |
| 18 February | Snake | Snake |

The 14 days from 4 February are the contested ones. The standard still counts them inside 1976, whose animal is the Dragon, because Lunar New Year has not arrived; chart-reading has already changed the year at Li Chun on 4 February. On 18 February the two lines meet: that day is Lunar New Year's Day itself, the first day of the Snake year under the standard, and chart-reading has been there since Li Chun. From then on both conventions read the same animal.

A birth on the boundary day itself is the harder case, because Li Chun is a moment rather than a day. The page linked above explains why it gives days and not times.

## Checking the 1977 dates yourself

The Observatory publishes one plain-text file per year — T1977e.txt for the year itself and T1978e.txt for the far end — a line for every day: the Gregorian date, the lunar date, the weekday, and any solar term falling on it. Four lines carry this page. 4 February 1977 prints Spring Commences, and the lunar column reads 17 — the seventeenth day of the twelfth month. 18 February prints 1st Lunar month. 4 February 1978 prints Spring Commences again, and 7 February 1978 prints 1st Lunar month.

The two lengths are two subtractions. 3 February 1978 minus 4 February 1977, plus one, is 365. 6 February 1978 minus 18 February 1977, plus one, is 354. The chart year is 365 days and the lunar year is 354. Neither number depends on a table of animals.

No clock time is given for either boundary, deliberately. A solar term falls on a day, and the same source does not carry the hour across the span these pages cover, so the page gives the day rather than borrowing the hour from another kind of source. A birth on one of the boundary days is the case this page cannot settle, and it says so instead of guessing.

Worth saying what the label is not. 丁巳 marks a birth year and a position in a count that keeps running. It says nothing about how the year went for anyone, and nothing about how a person born in it will turn out; there is no body of evidence behind a claim of that kind, so this page leaves it out.

## Where the 1977 dates come from

Li Chun, Lunar New Year's Day and every lunar month start are read from the Hong Kong Observatory's Gregorian-Lunar Calendar Conversion Tables for 1977 and 1978. The heading quoted near the top is that table's own first line, English and Chinese. The 365 and 354 figures are differences between dates in those files, not estimates, and the weekdays printed beside them are the table's.

The lunar months themselves are compiled under GB/T 33661-2017, the national standard drafted by the Purple Mountain Observatory. [Chinese Zodiac Year Boundary](/blog/chinese-zodiac-year-boundary-dates) lists both lines for every year from 1940 to 2030 with the gap in days, which is where the ten years of shared weekdays come from. [Snake](/blog/snake-chinese-zodiac) covers the animal on its own. [How we cite](/how-we-cite) sets out how sources are chosen and dated here.

The full table behind this page — 1901 to 2100 — is published as a free dataset: [chinese zodiac year boundaries](/zodiac-dates).

## Key points

- 1977 is 丁巳, Ding-si: the fourth heavenly stem over the sixth earthly branch, term 54 of the sixty, and fire, so a Fire Snake. The classical six-harmony tables pair Si, the Snake, with Shen, the Monkey; the clash table sets it against Hai, the Pig, and its three-harmony ring is Si–You–Chou — the Snake with the Rooster and the Ox.
- Li Chun is 4 February and Lunar New Year's Day is 18 February, fourteen days later, so the two boundaries fall on the same weekday — a Friday.
- Both lines share a weekday only when the gap is a multiple of seven. Across 1940 to 2030 that is ten years out of ninety-one, and only three of them are a full two weeks.
- A year's two tails sit one day before the next year's two lines, so the distance between the tails is always the next year's gap: 1977's is 14, 1978's is 3.
- The chart year runs 365 days and the lunar year 354; the window between the lines is 15 calendar days, 14 of them read differently by the two conventions.

## Sources

- Hong Kong Observatory — Gregorian-Lunar Calendar Conversion Table for 1977 (the file this page reads) — https://www.hko.gov.hk/en/gts/time/calendar/text/files/T1977e.txt (accessed 2026-10-20)
- Hong Kong Observatory — Gregorian-Lunar Calendar Conversion Table (year index) — https://www.hko.gov.hk/en/gts/time/conversion1_text.htm (accessed 2026-10-20)
- GB/T 33661-2017 《农历的编算和颁行》 — national standard record (drafted by the Purple Mountain Observatory; in force 1 September 2017) — https://std.samr.gov.cn/gb/search/gbDetailed?id=71F772D817FDD3A7E05397BE0A0AB82A (accessed 2026-10-20)
- Guangming Online (光明网) — what GB/T 33661-2017 fixes as the start and end of a zodiac year — https://m.gmw.cn/2024-02/08/content_1303656542.htm (accessed 2026-10-20)
- Hong Kong Observatory — 1977 年公曆與農曆日期對照表 (the Chinese table whose heading prints 丁巳 next to 肖蛇) — https://www.hko.gov.hk/tc/gts/time/calendar/text/files/T1977c.txt (accessed 2026-10-20)
- Hong Kong Observatory — Gregorian-Lunar Calendar Conversion Table for 1978 (read for the Li Chun on 4 February and the Lunar New Year on 7 February, which close this year's counts) — https://www.hko.gov.hk/en/gts/time/calendar/text/files/T1978e.txt (accessed 2026-10-20)
- GPTbazi — BaZi methodology and the solar-term boundary — https://gptbazi.com/about (accessed 2026-10-20)
- GPTbazi — how sources are chosen and dated — https://gptbazi.com/how-we-cite (accessed 2026-10-20)

---

Plain-text version of https://gptbazi.com/blog/1977-chinese-zodiac — same content, no scripts. Rendered page: https://gptbazi.com/blog/1977-chinese-zodiac