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Frequently Asked Questions

Can you send me the algorithms you used to calculate sunrise and sunset?

FAQs for SunriseSunset.com
No, but you can search the Internet and find code that others have made available. Try Online Calculators and Sky & Telescope -- follow the Resources link. I got my algorithms from a book, "Astronomical Algorithms" by Jean Meeus, ISBN 0-943396-35-2, published by Willmann-Bell Inc. He also has a book "Astronomical Formula for Calculators" that is probably better for programmers. You can order them at a real bookstore or online.
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Will there be a moon? When are sunrise and sunset?

Hardrock Hundred FAQ (Frequently Asked Questions)
Here are the specifics for Silverton: Friday, July 11: Sunrise 5:58 am Sunset 8:34 pm Moonrise 12:25 pm Moonset after midnight 39% waxing Saturday, July 12: Sunrise 5:59 am Sunset 8:34 pm Moonrise 1:20 pm Moonset 12:29 am 50% waxing Sunday, July 13: Sunrise 5:59 am Sunset 8:33 pm Moonrise 2:17 pm Moonset 1:013 am 58% waxing
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When is Sunrise and Sunset?

SunPosition Calculator FAQ
Most countries consider Sunrise and Sunset to be when the sun is at an altitude of -0.833 degrees 'atmospheric refraction accounted for', this is when the upper edge 'rim' of the sun touches the horizon. One of the exceptions is the Swedish national alamancs, which use -0.583 degrees 'atmospheric refraction accounted for', this is when the center of the Sun's disk touches the horizon.
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Why should I use your service to calculate sunrise/sunset when I can get it on the web?

Applied Meteorology, Air Quality, Environmental and Air Perm...
Many standard sources of sunrise/sunset and moonrise/moonset are for particular locations, such as Central Park, in New York City. The times listed are only valid for that location. MES can calculate the precise time of these astronomical events for your specific location. In addition MES can also provide the times of the beginning and ending of civil twilight, as well as the location of the sun, if required.
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Can sunrise, sunset and time of day be used to govern system behavior?

Colorado vNet - Frequently Asked Questions
Yes. The bridge uses zip codes to determine sunrise/sunset times, and these can be used to trigger or govern events. For example, outdoor PIR-actuated lights can be configured to turn on only after sunset.
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How accurate are sunrise/sunset computations?

SunPosition Calculator FAQ
SunPosition calculations are probably as accurate as it is possible to get with any computer program, on saying this the times of sunrise and sunset phenomena cannot be precisely computed to 100% accuracy on any computer program, because in practice, the actual times depend on unpredictable atmospheric conditions that affect the amount of refraction at the horizon. Thus, even under ideal conditions (e.g.
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What's the time zone and when is sunrise and sunset?

Frequently Asked Questions
Alaska time is one hour later than Pacific time, two hours behind Mountain Time, three hours behind Central Time and four hours behind Eastern Time. Daylight savings time occurs as in most states from April to October. Get sunrise and sunset information on your trip. (Select Ketchikan, Thorne Bay, or Craig for the nearest locations.)
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The Sunrise/Sunset Times are sometimes inaccurate. Why?

MetWeather Frequently Asked Questions (FAQ)
The Sunset/Sunrise/Twilight times are calculated from the Longitude & Latitude for the current Default Location. Likewise, the times are adjusted according to Daylight Savings Time for the current location you reside within (more technically, which Time Zone your computer's system clock is set to).
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Are Sunset and Sunrise Points the best places to view sunrise and sunset?

Bryce Canyon National Park - Frequently Asked Questions (U.S...
Not necessarily. Nearly all viewpoints face east and offer spectacular views of the canyons bathed in morning's rich, dramatic light. The two most popular viewpoints for sunrise are Sunrise Point and Bryce Point. For sunset, pick your favorite overlook (we recommend Inspiration Point or Paria View) and plan to arrive 1½ hours before sunset for the best lighting.
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Can we have a sunrise or sunset ceremony?

Virginia Beach Weddings FAQ Page
Yes, with additional fee Sunrise (Dawn) Ceremony 6:30am to 9:00am $125 additional - No extra fee for sunset - SUNRISE/SUNSET TIMES TABLE
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Is my Sunrise and Sunset shown anywhere?

Frequently Asked Questions
Yes, it is shown in the About window (View, About). The times are shown in GMT. Also local standard time is shown.
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What direction are the villas facing for sunrise and sunset ?

Villas "Lombo Branco Village" - Cape Verde Propert...
All the villas have slightly different orientations, but from all living rooms, you are able to see sunrise and sunset over the sea, depending on which month sunsets behind the mountains.
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What time is the sunrise and sunset in Drake Bay?

About The Rainforest Chalet in Drake Bay, Costa Rica
With little year round variations, the sun rises between 5:15 and 5:30am and begins setting around 5:30pm. Gianfranco Gómez and Tracie Stice. All Rights Reserved. The use of any photographs, reproduced in any form or by any means, electronic or mechanical, or stored in a retrieval system, without prior consent of the owner - is an infringement of the copyright law and is forbidden.
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Why do balloons only fly at sunrise or a few hours before sunset?

Hot Air Ballooning FAQs
During the summer, the winds are the calmest in the morning or early evening. In our part of the country, balloons usually will not fly in winds more then 10-12 miles per hour. The hills and valleys create turbulence when it is windy, which makes it unsafe to fly. In the plain states where it is flat, balloons are able to fly in higher winds because the land is flat and therefore usually less turbulent. The heat of the sun also causes turbulence as it warms the ground.
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What are the sunrise and sunset times for my area this year?

Frequently Asked Questions | NRC-INMS
NRC's Herzberg Institute of Astrophysics maintains a web page giving sunrise and sunset times for Canadian cities or latitude/longitude positions. Here you will also find other related information. 
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How to set sunrise/ sunset times in Cardio?

Domotique Secant Home Automation
Go to the screen called "sun" and enter the correct longitude and latitude data according to your location (default data are those of Montreal).
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Why aren't the sunrise and sunset equal on the equinox?

Welcome to India Weather
Sunrise and sunset are calculated when the top of the sun is on the horizon. However, equal daylight is measured from the center of the sun -- accounting for a few minutes. The other discrepancy is from when the sun is on the horizon, the Earth's atmosphere bends the sun's light. a result, the sun still looks to be above the horizon for a few minutes after it has already set. The U.S. Naval Observatory takes this into consideration when calculating sunrise and sunset times.
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What is the view like: can you see the sunrise or sunset from the cabins?

Frequently Asked Questions - Blue Moose Cabins
Each Cabin is quite private and positioned back from Highway 395 make them very relaxing and quiet. The Cabins are about 7 years old, quite modern (not rustic) and are available for rent year round for reasonable Daily & Weekly rates. Although not on the waterfront; Each of the cabins enjoy views of Lake Roosevelt from a covered deck. I'm certain that you will not be dissappointed at the serenity to be enjoyed on the patios during each evening.
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What encryption algorithms are used?

Wireless Computer Networking - FAQs
The Outdoor Routers encrypt MAC layer data payload using RC4. Type? RC4, either 40 ("Silver cards") or 104 bits ("Gold Cards) with a 24 bits Init Vector. Bit-rate? 1, 2, 5.5 or 11 Mbit on air-interface (assuming this is not refered to as the bitrate of a PPP-like link).
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Why do balloon flights only take place at sunrise and sunset?

Welcome to Above Reality - Vermont Hot Air Balloon Rides - L...
Calm to light winds are the most desirable for a balloon flight. Wind is created by the uneven heating of the Earth's surface. The winds are lightest when the sun is rising (Earth is just starting to warm) or setting (Earth has already started to cool). A balloon flight revolves around Mother Nature and we don't like to test her limits. PLEASE be on time for your flight since it is very important that we take off as scheduled.
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How can I find out the times of sunrise, sunset, moonrise or moonset for where I live?

Weatheroffice Frequently Asked Questions - Environment Canad...
Environment Canada is not an official source for this data, however as a courtesy, approximations for sunrise and sunset are available on the city forecast page nearest your location. Official times for sunrise and sunset can be found on the Web site of the Herzberg Institute of Astrophysics of the National Research Council of Canada. Web site options for calculating moonrise/moonset include: Timeanddate.com or the U.S. Naval Observatory site.
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Weatheroffice Frequently Asked Questions - Environment Canad...
You can find those times on the Web site of the Herzberg Institute of Astrophysics of the National Research Council of Canada, at http://www.hia.nrc.ca/sunrise_e.html If you want a locality that does not appear in the list of cities, you will need to find its latitude and longitude. You can find these on the Canadian Geographical Names site of Natural Resources Canada, at http://geonames.nrcan.gc.ca/search/search_e.php You can also use the U.S. Naval Observatory site.
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Why does the Sunrise/Sunset screen have a different location to the one that I have selected?

Islamic Research Centre
The Sunrise/Sunset screen does not automatically use your current deafault location. To select the city that you wish to see the sunrise / sunset times for tap the stylus onto the screen where it says FN and the Islamic Research Centre. This will bring up the city selection list. Scroll through the options using the scroll bar on the right hand side of the screen. Select the city of your choice by tapping the stylus onto the city name.
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On my system, the times HCA computes for sunrise and sunset are way off. What could be wrong?

FAQ
This may be due to one of two problems. The location you selected when you created your home design was incorrect. You can check this by using Home->Properties and the location tab in that dialog. Either enter the latitude and longitude of your home or chose a nearby city. The other problem may be the time zone is not correct for your location. This can be checked from the Windows Control Panel Date/Time applet.
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What sunrise and sunset times are represented on the clock face?

Skyclock - FAQ (Frequently Asked Questions)
Skyclock uses civil and nautical twilight as the basis for the shaded display because these two periods match with how people think of twilight. In other words, while technically in a twilight phase, people usually think it is night during the astronomical twilight period. This applies to both sunrise and sunset periods.
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Where does all the information in Skyclock about sunrise and sunset times come from?

Skyclock - FAQ (Frequently Asked Questions)
The Federal Government of the United States provides localized sunrise and sunset information. This information is used by numerous weather services and others. Skyclock transforms this information to a graphic display on an analog clock face.
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I was wondering if you could make the sunrise/sunset times available for the Palm Pilot computer?

FAQs for SunriseSunset.com
I currently use Astro Info, which I downloaded a few years ago, but I'm not sure it's available now. In any case, I do not intend to adapt my sunrise/sunset program to the Palm Pilot.
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