年齢計算
年、月、日などで正確な年齢を計算します
合計38,133日です
| 曜日： | 木曜日 |
|---|---|
| 次の誕生日 | 🎉 次の誕生日まで218日 |
| 1921はうるう年でしたか？ | いいえ、1921はうるう年ではありませんでした。365日でした。 |
よくある質問
1921/12/01に生まれた場合、何歳ですか？
1921/12/01に生まれた場合、あなたは104歳4ヶ月26日です（2026/04/27時点）。合計38,133日です。
1921/12/01は何曜日でしたか？
1921/12/01は木曜日でした。
1921はうるう年でしたか？
いいえ、1921はうるう年ではありませんでした。365日でした。
♐ Your birth constellation: Sagittarius
Traditional dates: November 22 – December 21
Sagittarius lies in the direction of the center of our Milky Way galaxy. When you look at Sagittarius, you are looking toward the supermassive black hole Sagittarius A*, which has a mass of about 4 million suns. The constellation contains more Messier objects (star clusters and nebulae) than any other, making it a favorite target for amateur astronomers. The "Teapot" asterism within Sagittarius is one of the easiest star patterns to spot.
The zodiac system was created by Babylonian astronomers around 500 BCE as a coordinate system for tracking the Sun, Moon, and planets along the ecliptic. The twelve signs divide the ecliptic into 30-degree segments. Due to the precession of equinoxes — a 26,000-year wobble of Earth's axis — the astrological dates no longer correspond to the actual constellations the Sun passes through. Modern astronomy treats the zodiac as a historical coordinate system, not a personality framework.
Read more about the astronomical history of the zodiac in our complete zodiac guide.
🐓 Chinese zodiac: Rooster (Metal)
In the traditional Chinese calendar, 1921 is a year of the Rooster with the element Metal. The Chinese zodiac (shengxiao) is a repeating 12-year cycle, with each year associated with an animal. Combined with the five elements (Wood, Fire, Earth, Metal, Water), the full cycle takes 60 years.
The Rooster (or Chicken) is associated with punctuality and fidelity in Chinese culture, as the rooster's crow marks the break of dawn. It is one of the "six domestic animals" that were central to Chinese agricultural life. In Chinese painting tradition, the Rooster symbolizes the five virtues: literary, martial, courageous, benevolent, and trustworthy.
The Chinese zodiac is a cultural and calendrical tradition with roots stretching back over 2,000 years. It was originally tied to astronomical observations of Jupiter's roughly 12-year orbital period. While widely used in East Asian cultures for festivals, naming customs, and social tradition, it is best understood as cultural heritage rather than a predictive system.
Explore the full Chinese zodiac cycle in our Chinese zodiac guide.
| Zodiac sign | ♐ Sagittarius |
|---|---|
| Chinese zodiac | 🐓 Rooster |
| Generation | Greatest Generation |
年齢に関する豆知識
The first known birthday party invitation dates back to around 100 CE in the Roman Empire.