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January 30

Day 30 of 366 · ISO week 5 · Aquarius · Winter (Northern Hemisphere)

January 30 is the 30th day of the year in the Gregorian calendar; 336 days remain until the year's end. It falls in winter (northern hemisphere) and under the astrological sign of Aquarius.

Day of year
30
Days remaining
336
ISO week
5
Zodiac
Aquarius
Season
Winter
Sun declination
-18.0°

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 30 ≈ -18.0°
0° +23° −23° -18.0°
Computed via Cooper's formula. Positive declination = Sun north of the celestial equator (Northern Hemisphere summer).

On January 30 the Sun's declination is approximately -18.0°. 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 30.

Position in the year

Position in the calendar year — day 30 of 366 (with 336 remaining)
JanFebMarAprMayJunJulAugSepOctNovDec Jan 30

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 (30)2 × 3 × 5 · composite (no)
Days remaining (336)2^4 × 3 × 7
Date code DDMMYYYY30012026 · no palindrome in next 200 years
Sun declination-18.04° (Cooper approximation)
Distance from solstice41 days

Cross-references

The 30th of every other month

March 30April 30May 30June 30July 30August 30September 30October 30November 30December 30

Adjacent days

← January 29January 31 →

Days nearby

-30 days · December 31-7 days · January 23+7 days · February 6+30 days · February 29

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