R. BOUWMEESTER & ASSOCIATES
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Updated May 1, 2013
R. Bouwmeester & Associates, a civil engineering firm, provides specialized sun and shadow position modeling services related to traffic accident and crime scene reconstruction, and urban development, site planning and building design projects.
Initial consultations are free of charge. Contact us.
In the accident and
crime scene reconstruction fields we are called upon to
confirm historical sunrise and sunset times, to determine the sun's
position relative to the field of view of a driver (or pedestrian), to
determine the limits of shaded vs. sunlit areas, and to provide general
input related to glare, blinding, contrast, shadowing, visibility,
ambient lighting, etc.
We also provide investigators with alternate dates and times at which a scene can be visited and photographed under similar lighting conditions (e.g. including daylight, dawn and dusk).
In addition, we conduct forensic shadow analyses of photos and videos to determine (or confirm) the date and time they were taken. Alternatively, if the date and time are known, we can narrow down the location where the photo or video may have been taken.
In the fields of urban development, site planning and architecture we are called upon to prepare shadow impact studies, solar access studies and daylighting analyses. Shadow impact studies include technical reports and drawings showing the predicted shadow patterns of proposed building projects. From these we determine how much sunlight will be lost in specific locations as a result of the building project. Solar access and daylighting studies allow architects and planners to maximize exposure to sunlight in specific areas within a building (e.g. sunroom, living room, etc.) or on a site (e.g. pool, patio, etc.).
Enquiries are always welcome, and our Clients throughout the world appreciate our prompt and personal responses.
Do you need to know an historical sunset time for an accident investigation, or a future sunset time for an outdoor wedding? We would be happy to provide the answers...free.
We regularly answer questions such as...
...what time was sunrise(set)?
The modeling is carried out through the use of a computer model developed by Ralph Bouwmeester which simulates the daily "motion" of the sun and calculates its position in the sky relative to any location on earth at any time - past, present or future.
Mr. Bouwmeester provides expert witness testimony in the field of sun position modeling. He has appeared as an expert witness before criminal court, civil court and land use tribunals (Ontario Municipal Board) in accident cases, criminal investigations, and land development application hearings.
The firm provides opinion letters, technical analyses and reports, and CAD drawings (including plan views and 3D driver's eye perspectives).
Mr. Bouwmeester is available to address seminars and conferences on this topic.
(May 1, 2013) Sample sunrise/sunset tables for May 2013 have been posted. The tables include the times of rise and set as well as the time of solar noon and the total number of daylight hours for each day of the month. Note: All times are given in Standard Time; adjust for Daylight Saving (Summer) Time if in effect.
The sample tables are updated each month and include:
Barrie, Calgary, Halifax, Ottawa, Slave Lake,
Toronto, Vancouver, Winnipeg
Click here to view or print the samples or to order a free table for your location.
(October 10, 2012) 2012 Halloween sunset times added for select Canadian and US cities.
(August 1, 2012) Reminder: Sunrise/sunset tables for the London 2012 Olympics.
(August 1, 2012) Sunrise/sunset tables for Calgary AB have been added.
(February 13, 2012) We were interviewed for this story about a crossing guard hit by a car in Cresskill NJ on Feb 10/12 where police suspect sun glare was a possible factor.
(February 3, 2012) We have added sunrise/sunset tables for the London 2012 Olympics.
(October 19, 2011) 2011 Halloween sunset times added for select Canadian and US cities.
(October 11, 2011) Our interview with the Times Herald-Record of Middletown NY. "Judy Rife: A sure sign of autumn: sun glare when driving."
(May 17, 2011) This month's sunrise/sunset table for Slave Lake Alberta has been posted.
(March 11, 2011) To provide rescue workers with daylight availability data for Japan after today's earthquake and tsunami, we have added a sunrise/sunset table for Sendai.
(March 1, 2011) Ottawa has been added to our list of sunrise/sunset tables.
(November 16, 2010) We welcome you to follow us on Twitter at @SunPosition.
(October 20, 2010) 2010 Halloween sunset times added for select Canadian and US cities.
12, 2010) An article has been added regarding ceremonies
held in June 2010 at the Air India Memorial in Toronto. The
ceremonies marked the 25th anniversary of the bombing of Air India
Flight 182 and were highlighted by an address by
Canadian Prime Minister Stephen Harper on the June 23 anniversary date,
and a private ceremony on June 28 attended by Indian Prime Minister
(May 19, 2010) Two media articles have been added describing the recent vandalism to the Air India Memorial Sundial in Toronto. The story of our design and the unveiling in 2007 can be found here, while the media articles about the vandalism can be viewed here - Global TV, Toronto Sun.
(April 12, 2010) We have added an article about the dangers of sun glare while driving during the spring and fall. The article includes a link to a story and interview with us as published in the Omaha World-Herald on April 1, 2010.
(February 4, 2010) In early 2008 we were retained by BBDO (Toronto) to design a solar-powered billboard (actually a shadow-animated billboard) for a Frito-Lay SunChips ad campaign by Juniper Park of Toronto. The billboard was installed in Oakland CA on Earth Day 2008 to mark the opening of the solar-powered SunChips plant in nearby Modesto. A time-lapse video of the Sunchips Solar Billboard can be seen here. Congratulations to Juniper Park, who on January 28, 2010, took home the 2009 Cassies Grand Prix for the SunChips ad campaign.
(January 14, 2010) A free sunrise/sunset table has been added for Port-au-Prince, Haiti, in support of those involved in rescue and relief work. The table provides rise and set times and the total number of hours of available sunlight for each day of the current month.
(January 6, 2010) Free sunrise/sunset tables have been added for those of you visiting Vancouver or Whistler BC during the Olympics and Paralympics in February and March.
(October 30, 2009) Halloween sunset times added for select Canadian and US cities.
(October 1, 2009) Sample photos of the effects of sun glare while driving.
(September 30, 2009) In response to numerous enquiries, we have prepared a graphic showing the duration of sun exposure on the various faces of a building. Our sample applies to Toronto ON and is based on the orientation of Toronto's street grid.
(July 27, 2009) We have added a Blog which has been set up as a discussion board where you can post stories or ask questions.
(January 5, 2009) Sample sunrise/sunset tables have been added for Chicago, Denver, Halifax, Houston, Miami, New York City, San Francisco and Winnipeg.
(December 15, 2008) The story of our design of the Air India Memorial Sundial unveiled in Toronto, Ontario, by Prime Minister Stephen Harper on June 23, 2007.
(October 14, 2008) See this YouTube page for a time-lapse video of the SunChips solar billboard in Modesto California as designed by R. Bouwmeester & Associates.
1, 2008) Commuters' sun glare graphic as published in
the Des Moines Register on September 16, 2008.
(September 29, 2005) Article entitled, Equinox means more problems for commuters, re-printed from the East Valley Tribune (September 29, 2005 edition)
(June 1, 2005) Commuters' sun glare graphic re-printed from the Des Moines Register (March 21, 2005 edition).
(March 24, 2005) "Search this Site" link added to Home Page.
(November 22, 2004) Two articles re-printed from the Des Moines Register:
Sept 16/04 - featuring our firm and the dangers of sun glare and driving
Sept 18/04 - mentioning our firm in an article regarding 1 fatality and 2 collisions blamed on sun glare.
12, 2004) Monthly sunrise/set tables are now available in three formats
(January 2, 2004) Our list of Representative Projects has been updated and reorganized.
(January 2, 2004) The following pages have been added:
· a media article mentioning our firm as printed in the Dallas Fort Worth Star Telegram recently
· an interesting news story about the dangers of sun glare and driving as it appeared in the San Francisco Examiner
· a sample 3D house model showing the shadow impact of a proposed second storey addition.
(March 1, 2003) The time format (hh:mm:ss) has been revised to make the times easier to read.
11, 2003) For those of you interested in this month's sunrise/sunset
data for the Middle
East, we have added tables for Baghdad, Kabul and Kuwait City.
Our data (much of it free) and modeling services have been used by professionals, organizations and individuals around the world. We would be pleased to provide you with the data you need, or to simply answer your questions in a personal and timely manner.
The following are just some of the types of clients who have sought our services:
reconstructionists, lawyers, and police
officers looking for historical sunrise or sunset times,
or sun position data related to an accident or crime scene. Contact us for
· architects, builders, developers and urban planners striving to...
· biotechnology professionals seeking data on sunlight and daylight availability
· criminal lawyers seeking input regarding time of day, visibility, lighting or identification issues. In addition, we provide forensic analyses of photos and videos to determine and/or confirm the date and time they were taken.
· golf industry professionals seeking data on sunlight and daylight availability
· homeowners, ratepayer group representatives, or municipal officials concerned about the shadow impact of a proposed development on a neighbourhood
· photographers, film industry professionals, and event planners looking for rise/set times (or sun position info) for future dates
· solar energy professionals
· sports teams, coaches and athletic organizations
· transportation professionals
Ralph Bouwmeester, P. Eng.
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