Angle Calculator (SAC)
former LOFSAC (Libbey-Owens-Ford Sun Angle Calculator) is available
again! This handy tool provides a relatively simple method of
determining solar geometry variables for architectural design, such
as designing shading devices or locating the position of the sun
relative to a particular latitude and time. The Sun Angle Calculator
is a quick and accurate tool and has been used extensively by
educators, researchers, and design professionals for the past 50
years. Permission to reproduce and distribute the Sun Angle
Calculator has been provided by Pilkington to the Society of
Building Science Educators (SBSE). The Sun Angle calculators are now
printed on a high quality styrene and have a nylon screw and nut for
quick assembly (no more chasing the little brass screws all over the
Contents of the Pilkington Sun Angle Calculator
Each Pilkington Sun Angle
Calculator contains the following items, which will be sent to you for
collation and assembly:
- Sunpath charts for 24, 28, 32,
36, 40, 44, 48 and 52° North latitudes
- 1 profile angle (red) overlay
- 1 equidistant altitude cursor
- assembly screw and nut
Please note that the instructional
manual for the Pilkington Sun Angle Calculator is not included with the
above package, but is available on the World Wide Web (see below).
The Libbey-Owens-Ford company was
acquired in 1986 by the largest global glass manufacturer, Pilkington,
and is now referred to as Pilkington North America (PNA). No portion of
the Sun Angle Calculator package (including the manual) may be
reproduced, translated, or transmitted in any form or manner by any
means -- including but not limited to graphic, electronic, and
mechanical methods without explicit written consent from Pilkington.
Please note that the daylight
availability overlays were too numerous to reproduce, but are
available in the appendices of Fuller Moore's book Concepts and
Practice of Architectural Daylighting (Van Nostrand Reinhold
Company, 1985). Please see external reflected component dot
charts B-10 to B-18, and Appendix C: Exterior Illuminance Overlays.
Your SAC Today!
Sun Angle Calculators are available for purchase at the following
||Quantities of 1 to 5:
||Quantities of 6 or more:
||Bookstores only: $20/each (with your institutional account number for UPS or FedEx or a
pre-paid shipping authorization for same. Each Pilkington Sun Angle
Calculator contains the items noted above, which will be sent to you
for collation and assembly and suggested shrink wrapping.)
includes shipping and handling via USPS within the
call CERES at (765) 285-1135 to arrange Alaska, Hawaii,
international, expedited, or bookstore orders. Please note
SBSE cannot process returns or replacement parts. If
ordering for a class, faculty are requested to place a
single order to expedite the process.
Sun Angle Calculators must be ordered using the
Important! Orders will no longer be accepted over the phone, by fax or via email. All orders must be processed through the online system.
|Payment may be made via credit card
only (Discover, MasterCard or Visa only).
You will receive confirmation
of your order via e-mail once
your credit card has been
processed. Your order will
then be shipped.
you have questions regarding ordering contact:
Office of the Director / CERES
Ball State University
Phone: (765) 285-1135 [8:00am - 5:00pm EST, Monday - Friday]
Fax: (765) 285-5622
The instructional manual that accompanies the Sun Angle Calculator
-- "Designing with the Pilkington Sun Angle Calculator" -- is now
available in electronic format and may be downloaded.
Manual (1.8 MB)
Update for magnetic variation. Download Magnetic Variation
PDF (200 kb)
Plot Your Own Sun Path Charts
The University of Oregon Solar Radiation Monitoring Laboratory
developed a sun path chart program that is a very handy resource! Just
put in latitude and longitude or zip code for U.S. locations, time zone,
and it prints out a pdf!
http://solardat.uoregon.edu/SunChartProgram.html Contact Lab
Director Frank Vignola <email@example.com>
for further information.