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January 18

Day 18 of 366 · ISO week 3 · Capricorn · Winter (Northern Hemisphere)

January 18 is the 18th day of the year in the Gregorian calendar; 348 days remain until the year's end. It falls in winter (northern hemisphere) and under the astrological sign of Capricorn.

Day of year
18
Days remaining
348
ISO week
3
Zodiac
Capricorn
Season
Winter
Sun declination
-20.7°

External references

Curated jump-off points to the major almanacs, encyclopaedias and primary sources for this date.

Wikipedia: this day →Britannica: this day →LoC: Today in History →History.com: this day →On-This-Day.com →BBC: On This Day →NYT: this day →Time and Date →NASA APOD archive →U.S. Naval Observatory →Wolfram|Alpha →Wikidata →Google Books →JSTOR →Internet Archive →
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Astronomy

Solar declination through the year — the Sun's apparent latitude on Earth. January 18 ≈ -20.7°
0° +23° −23° -20.7°
Computed via Cooper's formula. Positive declination = Sun north of the celestial equator (Northern Hemisphere summer).

On January 18 the Sun's declination is approximately -20.7°. At this latitude the Sun is south of the celestial equator, giving the Northern Hemisphere shorter days than nights.

For specific rise/set times at your location, see the U.S. Naval Observatory, or the NASA APOD archive for any imagery published on a January 18.

Position in the year

Position in the calendar year — day 18 of 366 (with 348 remaining)
JanFebMarAprMayJunJulAugSepOctNovDec Jan 18

Holidays & observances

No widely-observed holidays catalogued for this day in our base set. See the external almanacs above for region-specific observances.

Events

A selection of widely-documented historical events that took place on this date. Years marked BCE follow standard astronomical convention.

Notable births

Notable deaths

Numerical & calendrical curiosities

Day-of-year (18)2 × 3^2 · composite (no)
Days remaining (348)2^2 × 3 × 29
Date code DDMMYYYY18012026 · no palindrome in next 200 years
Sun declination-20.72° (Cooper approximation)
Distance from solstice29 days

Cross-references

The 18th of every other month

February 18March 18April 18May 18June 18July 18August 18September 18October 18November 18December 18

Adjacent days

← January 17January 19 →

Days nearby

-30 days · December 19-7 days · January 11+7 days · January 25+30 days · February 17

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