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| 2005/11/17-20 [Computer/SW/Unix] UID:40632 Activity:low |
11/17 I'm about to buy one of the condos in a big condo complex and
I'm concerned about lighting. I'd like to know at what angle
will the sun shine through the windows and if it'll be blocked
by other units (which by the way tend to protrude out). I'm
wondering about the path of the sunlight in respect to the
season. What is a good web site that'll tell you these things?
And since there is a 15 degree difference between true north
and magnetic north, which one do people use? Thanks.
\_ Just go there at the time of day you're worried about.
\_ The sun's path through the sky is different each day.
\_ true. only USGS maps and similar care about magnetic
\_ http://www.srrb.noaa.gov/highlights/sunrise/azel.html
http://aa.usno.navy.mil/data/docs/RS_OneDay.html
The sun uses geographical (true) north.
\_ I used to have an app on my Palm that would show you a true-north
compass if the time was set correctly and you input your latitude.
All you had to do was point it toward the sun.
You could use CyberSky to view the sun's position from the city and
that would give you those details, etc.
\_ ObHousingBubble
\_ If you really want to obsess about it,
http://www.solarpathfinder.com. -tom
\_ Best solar path visualizer: http://solar.anu.edu.au/Sun/SunPath |
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| www.srrb.noaa.gov/highlights/sunrise/azel.html Long: East=- West=+ ____ ____ ____ Note: To manually enter latitude/longitude, select Enter Lat/Long -> from the City pulldown box, and enter the values in the text boxes to the right. Directions: 1 Select a location from the City pulldown menu, OR select "Enter Lat/L ong ->" from the pulldown menu, and manually enter the latitude, longitude and time zone information in the appropriate text boxes. For this calculator, latitude is positive to the NORTH, and longitude is positive to the WEST of the prime meridian. Latitude and Longitude can be in deg/min/sec, or decimal degrees entered in the "Deg:" field. If you want to input latitude, longitude or time zone manually, be sure to select "Enter Lat/Long -->" from the City pulldown box, or your numbers will be overwritten by the selected city's location. Otherwise the time zone associated with the selected city's Local Standard Time will be automatically entered. Selecting "Yes" in the Daylight Saving field will cause the solar position calculation to assume the current time has been adjusted forward one hour from standard time. To perform calculations for a different date, simply select the month in the pulldown box, and enter the day and four digit year in the appropriate input boxes. Time of day for the calculation can be changed in the same way. Once the calculations are complete, you may use your browser's "Print" function to obtain a hardcopy of the results. Results are given in the following units: Equation of Time in minutes of time; Solar Declination in degrees, with positive to the north; |
| aa.usno.navy.mil/data/docs/RS_OneDay.html AA Home Complete Sun and Moon Data for One Day bar You can obtain the times of sunrise, sunset, moonrise, moonset, transits of the Sun and Moon, and the beginning and end of civil twilight, along with information on the Moon's phase by specifying the date and location in one of the two forms below and clicking on the "Get data" button at the end of the form. City or Town Name: The place name you enter above must be a city or town in the US The pla ce's location will be retrieved from a file with over 22,000 places list ed. Either upper- or lower-case letters or a combination can be used. Sp ell out place name prefixes, as in "East Orange", "Fort Lauderdale", "Mo unt Vernon", etc. ", which is entered as an ab breviation with a period, as in "St. You need only enter as many characters as will unambiguously identify the place. Day: __ Longitude: east west ___ degrees __ minutes Latitude: north south __ degrees __ minutes Time Zone: hours east of Greenwich west of Greenwic h Place Name: The place name you enter above is used only in the table header; you can enter any identifier, or none (avoid using punctuation characters). rise/set table program, which computes a one-page t able covering an entire year. For US cities or towns (Form A), the output times will be on a 12-hour clock (with "am" or "pm" listed); for worldwide locations (Form B) t he output times will be on a 24-hour clock. For US cities or towns (Form A), the times of the phenomena are present ed in the standard time of the place requested, using the current time z one of the place. Daylight time is implemented only for US cities or towns (Form A) a nd only for years 1967 and later, in accordance with the Uniform Time Ac t of 1966 and subsequent legislation. Daylight time is not used for plac es currently exempt from it. Clicking o n this link will provide a map of the area surrounding the location for which astronomical data have been given. The large red dot in the middle of the map indicates the location for which the data were computed. The width of the map is 025 degrees of longitude, equivalent to 1 minute o f time in rise/set phenomena. Except for some critical cases in Alaska, the map roughly indicates the area within which the computed astronomica l data are valid. For worldwide locations (Form B) that require it, the time zone can be en tered in hours and a fraction. For example, for locations in India, the time zone may be entered as 55 hours east of Greenwich. The time zone f ield can accommodate up to five characters. |
| www.solarpathfinder.com Other inventors also tried to answer the same call for a solar site analysis instrument, but none surpassed the Pathfinder in its engineering, accuracy, ease o f use, comprehensiveness in solar site data collection. Sola r Pathfinder can be used anytime of the day, anytime of the year, and i n either cloudy or clear weather. One siting takes only minutes and requ ires no special skills or technical know-how. One simple tracing becom es the permanent record for the solar data. Pathfinders unique ability to give quick, accurate solar/shade informa tion for the entire year has proven to be the instrument of choice in se veral different industries: Architecture, Ecological Studies, Engineerin g, Fisheries, Forestry, Golf Course Management, Landscaping, Realtors/Ap praisers, Universities/Technical Schools, Utility Companies, etc. |
| solar.anu.edu.au/Sun/SunPath -> solar.anu.edu.au/Sun/SunPath/ This applet models the Sun's path in a geocentric view, it calculates and visualizes the position of the Sun based on the latitude and the time. It allows to simulate the Sun's position and path during an hour, a day, a month and a year. For a more precise calculation of the Sun's position, more data are neede d that the program does not use, for example longitude, time zone, dayli ght savings time and the year. The program simplifies the calculations and uses the average interval bet ween two successive crossings of the Sun over the same meridian. The cal culations are referred to the center of the solar disk. There are some other data to keep in mind for a better comprehension of t he Sun's path. This applet requires a recent version of the Java programming language. |