Solar Almanac: Sunrise Sunset
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About this app
Solar Almanac tells you when the sun rises and sets, anywhere in the world, on any date.
It works out the answer on your phone. There is no server, no account and no
connection needed, so it works on a plane, on a mountain and on a phone that has
never had a SIM in it.
FOR TODAY, AND FOR ANY OTHER DAY
Sunrise and sunset, with the compass bearing of each. How long the day is, and
whether that is longer or shorter than yesterday, to the second. Solar noon and
how high the sun gets. Step a day at a time, or pick a date years from now.
FOR PHOTOGRAPHERS
The golden hour and the blue hour, morning and evening, with the start and end
of each and how long it lasts. The bearing matters as much as the time: on a
midsummer morning in Scotland the sun comes up well north of east, and anybody
set up facing due east is looking at the wrong hill.
THE THREE TWILIGHTS
Civil, when there is still enough light to read outside. Nautical, when the
horizon is still visible at sea. Astronomical, when the sky is properly dark.
WHEN THERE IS NO SUNRISE TO SHOW
Above the Arctic circle and below the Antarctic, the sun does not rise for weeks
at a time, and later in the year it does not set. Most apps built on the same
equations print a blank, a dash, or midnight, because the arithmetic has no
answer and nobody decided what to do about it.
This one says it: the sun does not set today. It is a different sentence from
the sun does not rise today, and the app knows which one it means. The twilight
times are still there on a polar night, because there is still twilight.
A WHOLE YEAR AT ONCE
A chart of every sunrise and sunset for the year at one place, with the longest
and shortest days marked, and something almost nobody knows: the earliest sunset
of the year is about ten days BEFORE the shortest day. On a British chart you
can also see the two steps where the clocks change.
An app that fetches its times from a server would need 365 requests to draw that
page. This one does 365 sums.
YOUR PLACES
Save as many as you like — home, the coast, wherever you are going. Add one by
searching around 800 built-in places, or by typing coordinates in any of the
usual forms: decimals, degrees and minutes, or degrees minutes and seconds.
NO LOCATION PERMISSION UNLESS YOU ASK FOR IT
You pick a place. There is a button that fills in where you are, and the
permission is only requested at the moment you press it — never at launch, never
on first run, and never as a condition of using anything. Say no and everything
still works. It asks for APPROXIMATE location only, because a kilometre of error
moves sunrise by about two seconds, and precise location would be asking for more
than the answer needs.
ONE OPTIONAL NOTIFICATION
Off unless you switch it on. A daily nudge before sunrise, sunset or the golden
hour at the place you choose. It works out the right time every day, which a
fixed alarm cannot do, and it is deliberately inexact and set early — so the app
never asks for the exact-alarm permission that Play asks pointed questions
about.
IT IS ALL ON THIS PHONE
No account, no sign-up, no cloud, no sync, no server. Everything except the ads
works in airplane mode. Your places never leave the device, and Save a copy is
how you keep them: one file with everything in it, which is also how you move to
a new phone.
Six permissions. Two are for the ads that keep it free, one is what the ads SDK
adds itself, two exist only so the optional notification can arrive and survive
a restart, and the last is the approximate location you may never grant.
HOW ACCURATE IT IS
The times come from the solar position equations published by NOAA, which are
accurate to about a minute up to 72 degrees of latitude and less so beyond it.
That is why the app does not print seconds unless you ask it to: it would be
claiming a precision the arithmetic does not have.
It works out the answer on your phone. There is no server, no account and no
connection needed, so it works on a plane, on a mountain and on a phone that has
never had a SIM in it.
FOR TODAY, AND FOR ANY OTHER DAY
Sunrise and sunset, with the compass bearing of each. How long the day is, and
whether that is longer or shorter than yesterday, to the second. Solar noon and
how high the sun gets. Step a day at a time, or pick a date years from now.
FOR PHOTOGRAPHERS
The golden hour and the blue hour, morning and evening, with the start and end
of each and how long it lasts. The bearing matters as much as the time: on a
midsummer morning in Scotland the sun comes up well north of east, and anybody
set up facing due east is looking at the wrong hill.
THE THREE TWILIGHTS
Civil, when there is still enough light to read outside. Nautical, when the
horizon is still visible at sea. Astronomical, when the sky is properly dark.
WHEN THERE IS NO SUNRISE TO SHOW
Above the Arctic circle and below the Antarctic, the sun does not rise for weeks
at a time, and later in the year it does not set. Most apps built on the same
equations print a blank, a dash, or midnight, because the arithmetic has no
answer and nobody decided what to do about it.
This one says it: the sun does not set today. It is a different sentence from
the sun does not rise today, and the app knows which one it means. The twilight
times are still there on a polar night, because there is still twilight.
A WHOLE YEAR AT ONCE
A chart of every sunrise and sunset for the year at one place, with the longest
and shortest days marked, and something almost nobody knows: the earliest sunset
of the year is about ten days BEFORE the shortest day. On a British chart you
can also see the two steps where the clocks change.
An app that fetches its times from a server would need 365 requests to draw that
page. This one does 365 sums.
YOUR PLACES
Save as many as you like — home, the coast, wherever you are going. Add one by
searching around 800 built-in places, or by typing coordinates in any of the
usual forms: decimals, degrees and minutes, or degrees minutes and seconds.
NO LOCATION PERMISSION UNLESS YOU ASK FOR IT
You pick a place. There is a button that fills in where you are, and the
permission is only requested at the moment you press it — never at launch, never
on first run, and never as a condition of using anything. Say no and everything
still works. It asks for APPROXIMATE location only, because a kilometre of error
moves sunrise by about two seconds, and precise location would be asking for more
than the answer needs.
ONE OPTIONAL NOTIFICATION
Off unless you switch it on. A daily nudge before sunrise, sunset or the golden
hour at the place you choose. It works out the right time every day, which a
fixed alarm cannot do, and it is deliberately inexact and set early — so the app
never asks for the exact-alarm permission that Play asks pointed questions
about.
IT IS ALL ON THIS PHONE
No account, no sign-up, no cloud, no sync, no server. Everything except the ads
works in airplane mode. Your places never leave the device, and Save a copy is
how you keep them: one file with everything in it, which is also how you move to
a new phone.
Six permissions. Two are for the ads that keep it free, one is what the ads SDK
adds itself, two exist only so the optional notification can arrive and survive
a restart, and the last is the approximate location you may never grant.
HOW ACCURATE IT IS
The times come from the solar position equations published by NOAA, which are
accurate to about a minute up to 72 degrees of latitude and less so beyond it.
That is why the app does not print seconds unless you ask it to: it would be
claiming a precision the arithmetic does not have.
Sunrise, sunset, golden hour and twilight. Computed offline, for any date.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
What’s new
First release.
Sunrise, sunset, solar noon, the three twilights and the golden and blue hours,
for any place and any date. Everything is computed on your phone, so it works
with no connection and answers for any year.
Save the places you care about. Add one by searching or by typing coordinates.
Using your location is optional and only asked for when you press the button.
Above the Arctic circle it says the sun does not rise today, rather than
printing a blank.
Sunrise, sunset, solar noon, the three twilights and the golden and blue hours,
for any place and any date. Everything is computed on your phone, so it works
with no connection and answers for any year.
Save the places you care about. Add one by searching or by typing coordinates.
Using your location is optional and only asked for when you press the button.
Above the Arctic circle it says the sun does not rise today, rather than
printing a blank.
Everyone
Learn moreApp support
About the developer
Tito Panji
dash.fusion@outlook.com
LEGENDA PARK BLOK A 15/5
RT 12 RW 17 PADURENAN, MUSTIKAJAYA
BEKASI
Jawa Barat 17156
Indonesia
