Solstice Calendar
Date+ location+ altitude -0.833 deg= sunrise
KnownDate + placeFindSunriseAltitude-0.833 degAzimuthTrue bearingSkyPre-dawnLimitLevel horizon
CalculationTime
Solstice Calendar
A printable season-change planner for Astronomy Engine June and December solstice times, local UTC offsets, prep dates and daylight caveats beside the CalculationTime clockface.
Inputs, result, proof and time.
Use the instrument above, then check the calculation record, assumptions and related tools below.
Printable solstice calendar
Season marker and daylight prep
Sydney, Australia - 2027- UTC offset
- +10h
- Prep lead
- 21 days
- Season lens
- South
- Season markers
- Winter begins; Summer begins
June solstice
Tue, 22 June 2027 00:10
UTC estimate: Mon, 21 June 2027 14:10NorthSummer begins
SouthWinter begins
Prep dateTue, 01 June 2027
Daylight signalNorthern longest day; southern shortest day
The Sun reaches its northernmost declination. The exact longest or shortest daylight date can shift with location, horizon and local civil time.
December solstice
Wed, 22 Dec 2027 12:42
UTC estimate: Wed, 22 Dec 2027 02:42NorthWinter begins
SouthSummer begins
Prep dateWed, 01 Dec 2027
Daylight signalNorthern shortest day; southern longest day
The Sun reaches its southernmost declination. Solstice day length is location-specific and should be checked with a local sunrise calculator.
June22 JunePrep 01 JuneDecember22 DecPrep 01 Dec
Planner Notes
Use the prep date to confirm sunrise, sunset, event timing, school or workplace plans against current local sources.
Assumptions
Solstice instants come from Astronomy Engine Seasons(year). The selected UTC offset is applied only after the UTC event instant is found.
Limits
This is a planning worksheet, not an official almanac, daylight forecast, navigation aid, legal calendar or local sunrise/sunset authority.
Method
The worksheet computes solstice instants and converts them into a local planning calendar
The calculator calls Astronomy Engine Seasons(year), selects the June and December solstice UTC instants, converts each instant by the selected offset, subtracts the prep lead time, and keeps the source boundary visible in the printable report.
Astronomy basis
Solstices mark the Sun reaching its farthest north or south declination. Local longest and shortest daylight depend on latitude, horizon, refraction and civil time.
Print path
The print button opens browser print. The print stylesheet keeps both solstice rows, local offsets, prep dates, assumptions, notes and source limits.
Limits
This is a planning calendar, not an observatory almanac, sunrise table, weather forecast, navigation tool or official civil-time record.
Source Notes
Solstice times are engine-backed and local daylight still needs local data
CalculationTime uses Astronomy Engine for the UTC season instants and applies the selected UTC offset only after the astronomy calculation. Official almanacs, observatory tables and current ephemerides should still be used for publication-grade event times, daylight-saving changes, local sunrise/sunset and education or travel material.