SunNow vs Sun Path & Shadow Tracker

# SunNow Product Introduction Have you ever imagined an astronomy model that runs directly on your phone? Without a network connection or cloud computing, you can still know the solar time for your location, when the sun rises, when it sets, and when the moon may be visible. SunNow is exactly that kind of app. It brings the sun, Earth, moon, and your location into one on-device model. Based on latitude, longitude, altitude, date, and time, SunNow calculates sun angle, daylight, twilight, moon phase, and clear-sky radiation locally. You can drag the Earth and moon models to explore how light changes through a day, a month, and a year. In SunNow, time is not just digits on a clock. It becomes the sun's height, the day-night boundary across Earth, the glow before sunrise, the fading light after sunset, and the changing shape of the moon. ## A Sky Inside Your Phone SunNow is not just a weather app or a sunrise lookup tool. It is a local astronomy calculator for daily light, sun, and moon awareness. SunNow uses your current location or a place you select to calculate sun position, local solar time, daylight state, and moon information. You can see whether it is daylight, night, dawn, or dusk, and view sunrise, sunset, and a light curve. These calculations do not depend on the network. With no signal, no mobile data, outdoors, or on a plane, SunNow can still work. ## See Light, Not Just Time We look at time every day, but in real life, light often matters more than the clock. When does the sky begin to brighten? When is the light strongest? How long after sunset can you still see clearly? What phase is the moon in tonight? SunNow turns these questions into something visible. You can check sunrise and sunset, watch the twilight boundary move across Earth, observe clear-sky radiation, and scrub through time. ## Earth, Moon, and Your Location SunNow does not only give you a number. You can drag the Earth model to observe the day-night boundary, switch locations to compare solar states across cities, and save places you care about. The moon is part of the model too. SunNow shows moon phase changes and moon information, helping you see waxing and waning as a continuous process. ## Sunrise and Sunset Alarms For some people, sunrise and sunset are part of a daily rhythm. Regular alarms ring at a fixed clock time, but the sun changes with location and season. SunNow's sunrise and sunset alarms adjust based on your location and date. You can set reminders before sunrise, before sunset, or around specific solar events. For people who live, work, run, travel, photograph, or rest with the sun, this is an alarm that follows the sky. ## Offline, By Design The core features of the current version of SunNow do not require a network connection. Astronomy calculations happen on your device. Your location, saved places, display settings, and alarm rules are stored on your device. The app does not require registration or login, and it does not need to upload your location for its core calculations. You can grant location permission so SunNow can obtain latitude, longitude, and altitude automatically. You can also deny location permission and manually select a place. ## Who SunNow Is For SunNow is for people who care about natural light. It is useful for people living at high latitudes, where daylight length changes dramatically through the year. It helps outdoor workers, early runners, photographers, campers, hikers, commuters, moon watchers, stargazers, and anyone who wants to return their schedule to the sun. If you only want to know when the sun rises today, SunNow can answer that. If you want to understand why the light changes the way it does, SunNow can help you see it. SunNow is an offline astronomy app that uses Earth, the sun, the moon, and your location to show sunrise, sunset, daylight, twilight, moon phases, clear-sky radiation, and solar alarms that adjust with the seasons.

Where the sun will be and where the shadow will fall, for any place at any hour. Bearing, height above the horizon and shadow length, computed on your phone: offline, no account. For photographers chasing golden hour, gardeners, and anyone choosing an apartment, a campsite or a terrace table. THE THREE NUMBERS • Bearing — the compass direction the sun is in, right now • Height — how far above the horizon it stands, in degrees • Shadow — how long a shadow anything casts, in meters or feet They are the largest type on the screen, because they are the answer to the question you opened the app to ask. DRAG THROUGH THE DAY Take hold of the timeline and the sundial moves under your thumb. The shadow sweeps around the ground — short at noon, long at dusk — and vanishes the moment the sun sets. It is the fastest way to understand a day's light without reading a chart. HOLD IT UP TO THE SKY Point the camera at the horizon and the sun's whole arc is drawn over the view: where it rose, where it stands now, where it will set. It uses the compass and the tilt of your phone. No photo is taken, saved or sent. THE MAP Drop a pin anywhere and see the shadow direction for that exact spot. Useful before you view an apartment, plant a tree, book a table, or carry a tripod up a hill for nothing. SUN PATH PLANNING Look around Sun Path before you decide: it shows where the sun is for you right now. Everything else needs Sun Path Planning: a one-time purchase or a monthly subscription. It covers everything above, and: • Any date — next Tuesday, next June, or the morning of a wedding two years out • Any location on earth, not only where you are standing • Save the places you keep coming back to WHO IT IS FOR • Photographers and film crews chasing the golden hour and the blue hour • Gardeners working out which corner gets afternoon light • Architects, builders and solar installers checking overshadowing • Anyone choosing an apartment, a hotel room, a campsite or a terrace table HOW ACCURATE IT IS, AND WHAT IT ASSUMES The position is computed with the NOAA solar algorithm and is precise to a fraction of a degree. It assumes a level, unobstructed horizon: it knows nothing about hills, buildings, trees, cloud or weather. Sunrise and sunset are ideal-horizon times and will differ from what you see from your window. Treat it as a very good first answer, not a survey. Not for navigation, aviation or maritime use. It says nothing about UV — it is not a health or sun-exposure app. PRIVACY No ads. No analytics. No tracking. Your location is used on your phone to compute the sun and is never sent to me. The full policy is at the address below. BUILT BY ONE PERSON I read and answer every email, usually within two business days. If the sun looks wrong where you are, tell me the place, the date and the time and I will look — solar position is exact geometry, so a real error is reproducible and fixable. Support and privacy: https://anilsancarr-web.github.io/sunpath-site/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://anilsancarr-web.github.io/sunpath-site/privacy/ Bali photograph by Zexsen Xie, CC BY 2.0.