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The first time you open Skyclock after downloading from the app store you will be asked to 'allow' Location Services for the app. You should accept. Skyclock needs the ability to determine the location of the device (iPhone, iPad, Touch) in order to correctly display sunrise/set and twilight times. If you decline by mistake, you can easily remedy this on your device by going to Settings, and then pressing Locations Services. Make sure Locations Services is turned on at the top. Then scroll down the app list until you see Skyclock, and set to ON.
This refers to how many hours removed you are (at your current location) from the common time standard of Greenwich Mean Time. GMT does not observe Daylight Saving Time (also called Summer Time Change). Therefore, your GMT Offset will change if you are in an area that implements Daylight Saving Time, or Summer Time change. Skyclock automatically detects this change prior to displaying it's results.
The location service in the iPhone will use the information that is available to determine the app display. It will use GPS, cell tower coordination, or wi-fi location. If you are using Skyclock on an iPod Touch, wi-fi location is the only service available. Therefore, if your Touch is not detecting a wi-fi connection, it will not display current data. This applies also to using Skyclock on an iPad (in iPhone mode) if not connected to a cell network.
Skyclock for the iPhone does not have this display currently. At Skyclock.com, you can learn about and purchase a version of Skyclock for the pc that does have this capability. This is contemplated for a future i-Phone Skyclock upgrade..
Skyclock for the iPhone does not currently have this display. Thid feature is being strongly contemplated for a future version.
The iPhone is our first mobile device entry and we are very excited about it. We are actively engaged in further development, and are always interested in hearing from potential partners.
Yes.
During the time known as twilight, the hours are shown as orange. The remainder of night time hours are shown as black.
Skyclock shows relative specific solar time. That is, using the current date, sunrise and sunset times, and a specific location, Skyclock calculates and displays daylight, slice-of-pie twilight, and night.
Sunrise and sunset times are based on calculations, or algorithms, that result in a large set of tables. The facts have been checked for hundreds, if not thousands of years, going back to the Egyptians, who had a 365 day calendar.
We know when sunset occurs for a specific place on a certain date. Our ancestors watched and marked and measured, so that today we can predict where the sun is—we know its hour angle for any place if we know the date. What we know is transient, or dynamic, because the earth’s surface is in constant motion. Four solid facts combine to inform when sunset and sunrise occur:
Twilight is then displayed as a distinct pie-shape on an analog face between blue (day) and black (night).
No. Skyclock is based on solar events and positions.
The algorithms in Skyclock have been informed by the U. S. Naval Observatory and the National Renewable Energy Laboratory. Skyclock then uses the latitude, longitude and time zone for the desired location and transforms the position of the sun to a graphic display on an analog clock face.
Noctilucent clouds are “night-shining clouds” (NSCs), that dwell very high in the atmosphere, or mesosphere. They are often light blue, and assume odd shapes, such as strings. They are composed of water ice.
It’s an adjective relating to twilight. Also, an older person can be said to have “...crepuscular charm.”
In high latitudes it is the sun, visible 24 hours.
Afterglow is less-than-dark sky seen after sunset, sometimes called afterlight.
Airglow is a weak light emission in the earth’s atmosphere, also known as the faint glow of the night sky.
A shadow is a dark image caused by a body’s interception of light.
A clock dial is a clock face upon which “hands” or indicators point to certain numbers or tick marks.
Length of sunlight is the amount of time, measured in hours and minutes, that the sun is above the horizon.
a. In medicine, the sixty minutes after an accident.
b. In photography, when the sun’s shadows are orange, or “golden.”