Let the light pierce through the darkness Close all old accounts, turn a new leaf Re-learn that old lesson of friendship Kill nor be killed, settle for lessening Amidst us of this fossilized hatred
The Solar Post Light
Bringing The Light of Day into The Night
Perhaps that time has not come yet when our, Gods would listen to the beats in our hearts, peace and happiness spread their glow, perhaps we would have to force Mother Time?.
Solar Sail Simulations
A solar sail uses radiation pressure from sunlight as a means of propulsion.
It consists of a large mirrored sail to intercept and reflect the light,connected to a small spacecraft.
A small force is exerted perpendicular to the sail when light is reflected.
The contribution to this force by the solar wind is five thousand times smaller than the radiation pressure.
A solar sail has the potential to reach higher velocity than a rocket propelled spacecraft.
The journey time for a mission to our nearest star will be found by simulating some alternative maneuvers and spacecraft designs.
The total mass of the sail and spacecraft is 100 kilograms in every case.
We start with a sail size of 200 by 200 metres.
The simplest maneuver is a direct path from the Earth to the star.
The initial velocity of the spacecraft is set to 1.25 times the orbital velocity of the Earth.
The velocity after six months is 33 kilometers per second, which is barely maintaining its initial velocity.
Flight time to the nearest star is 36000 years.
Next we increase the sail size to 1000 by 1000 metres, and repeat the direct path to the star.
The short white line shows the orientation of the sail, and the yellow arrow shows the direction and magnitude of the force on the sail.
The velocity after six months is 168 kilometers per second. Flight time to the star is 7100 years.
An alternative maneuver is to do a close flyby of the Sun, making use of the greater light intensity.
The sail size is 200 by 200 metres, and the initial velocity of the spacecraft is set to 0.75 times the orbital velocity of the Earth.
The orientation of the sail can be controlled to increase or to decrease the orbital velocity of the spacecraft.
To approach the Sun the spacecraft must decrease its orbital velocity.
The sail is reoriented as the spacecraft passes the Sun, to increase the orbital velocity.
Closest approach is 20 solar radii, and the final velocity is 133 kilometers per second.
Next, another solar flyby maneuver but with a closer approach.
Onscreen are shown the flight day, the speed of the spacecraft in kilometers per second, the maximum acceleration in g’s, the distance of the spacecraft from the Sun in solar radii, and the closest approach in solar radii.
Notice that the spacecraft velocity remains almost constant as it leaves the Sun.
The radiation pressure is balanced by the gravitational attraction.
Closest approach is 10 solar radii, and the final velocity is 190 kilometers per second.
An extremely close flyby may produce a still higher velocity, if the spacecraft survives.
Closest approach is 2 solar radii, and the final velocity is 441 kilometers per second.
Flight time to the star is 2700 years.
What is effect of increasing the sail size ?
We increase the sail size to 250 by 250 metres, and repeat the solar flyby maneuver.
The radiation pressure is too great and it is difficult for the larger sail to approach the Sun.
Perhaps a hybrid sail would be of advantage.
Here we use a sail size is 200 by 200 metres when approaching the Sun, and a sail size of 400 by 400 metres when leaving the Sun.
Maximum accelaration is about a third of a g.
Closest approach is 10 solar radii, and the final velocity is 368 kilometers per second.
Flight time to the nearest star is 3300 years.
Duration : 0:7:32
Solar Eclipse 1999 Timelapse
Edit : No, it wouldn’t have seemed this dark to anyone with fully functional eyes. To quote wikipedia (CFL) :
“The response of the human eye to light is logarithmic: Each f-number (or photographic ‘f-stop’) reduction represents a halving in actual light, but is subjectively quite a small change”
More info :
http://www.crompton.com/wa3dsp/light/lumin.html
This was taken with a camcorder with a fixed aperture / shutter speed, so it’s actually a much more accurate record of the changes in light levels than our own visual observations.
Alternately : OMG check out this fake youtube video on youtube it’s fake and i should know because i am an internet expert on fake things on the internet
Original description : This is sped-up footage of Calne town centre in Wiltshire during the eclipse of August 11, 1999. I had set the camera up with a fixed shutter speed and iris which remained constant throughout, so the picture accurately reflects the change in light. Note people standing on corners looking up and cars turning their lights on! This video runs from pre-eclipse daylight through to the peak darkness and about a minute afterwards.
Duration : 0:3:10
Set/12 Stainless Steel Solar Lights
Buy it here: http://ow.ly/1ovCA
Set of 12 stainless steel solar lights. Soak up energy by day, then automatically light your walkway or garden at night. Each is 28″H (including stake) and has 1 super-bright white LED.
Duration : 0:1:19
Solar Drip Irrigation Benin, West Africa
The Solar Electric Light Fund (SELF) helps to set up a solar drip irrigation system in Benin.
Duration : 0:4:8
FL-1489 LED SOLAR LIGHT (6PCS)
To buy visit: http://www.festive-lights.com/solar-lights/fl-1489.html
Product code: FL-1489
LED Garden decorative solar stake set with Dragonflies. The Dragonflies are illuminated by a single seven colour LED (6 in total). Once activated the LED will slowly fade between each colour giving a beautiful effect.
Duration : 0:0:13
PHL1051Solar Meteor Light – Dragon Fly & Butter Fly Set
Solar Meteor Light – Dragon Fly & Butter Fly Set
Duration : 0:0:5
Solar Sign Light Installation
Learn How To Install your Solar Sign Light..www.ssliteadvantage.com.
Duration : 0:1:32
NewRay™ Solar LED Light Infomercial
NewRay™ Solar LED Light Infomercial
Duration : 0:2:11
PSL, Bangladesh, Solar PV co-operative – Ashden Award winner
This video can be downloaded here: http://www.ashdenawards.org/winners/psl PSL won an Ashden Award for Sustainable Energy in 2005. To find out more visit the link above and check out the Ashden Awards Blog http://ashdenawards.blogspot.com
The consultancy Prokaushali Sangsad Limited (PSL) realised the need for both quality lighting and employment for unskilled women on the remote island of Char Montaz. They set up the Coastal Electrification and Women’s Development Co-operative (CEWDC), and the 35 members assemble and sell photovoltaic solar home systems (SHS) to island families, and also run a battery charging service.
Char Montaz is a remote island in the Bay of Bengal, 18 hours by boat from Dhaka, the capital of Bangladesh. People live mainly by subsistence farming, fishing and trading. There is no grid electricity on the island, although a diesel mini-grid in the market provides lighting and facilities for battery charging. Generally people rely on kerosene lamps for lighting. PSL, which had been working on other development projects in the region, saw the need to find out what local women wanted to improve their situation. Following a survey of local households, they set up CEWDC. Since September 1999, the cooperative has assembled and sold SHS to over 360 homes, as well as supplying NGOs in other parts of Bangladesh, and has run a battery charging service for poorer families using both photovoltaic and diesel chargers.
Duration : 0:0:41
OGE NightGarden at “Light in Jerusalem Festival”, June 2009
The Enchanting Night Garden, at the First Jerusalem Lighting Festival (June 10-16), Gan Habonim (Migdal David, Jerusalem Citadel)
You are invited to enter the enchanting Night Garden and to take a stroll among its flowers, immersing yourself in a sensual delight of magical light, bright sounds and fragrant aromas…Powered by solar energy, the flowers are charged by sunlight during the day; and illuminated through energy-saving LED lights, at night.
The Garden demonstrates the importance and beauty of alternative energy, in protecting the environment, thus, safeguarding our future.
The project is in cooperation with the Israel Electric Corporation, which encourages the use of alternative energy for benefit of our environment.
This magical Garden offers a variety of flowers of different sizes and types of illumination: Giant Lotus Flowers, over four meters in diameter, intermittently opening and closing, and changing colors at a subtle pace; while delicate tulips, illuminated by one color of varying intensities; and masses of gently glowing dewdrop flowers, create an poetic ambience of tranquility, sensual beauty and pure serenity.
The Garden comes alive not only through the light and mechanical opening of the flowers, but also through the gentle music of the Hang – composed by two highly talented artists, Ravid Hang (GB) and Andi Isler (CH), who have contributed their amazing work toward completing this multi-sensual experience. You can also listen to these songs on their websites: www.ravidhang.com and www.musick.ch.
As O*GE Architects and InteractiveGallery, we are continuously exploring challenging issues in architecture & design; green and environmental protection; and social responsibility. We truly hope that you will enjoy this Garden and its magical atmosphere. Should you do so, please invite your family and friends to join in this experience; and do share impressions, feelings, photos and videos, on the internet, youtube, flickr, etc.
Together, let’s demonstrate that by using alternative energy, not only are we safeguarding our environment, but, we are also creating a poetic, magical experience
For further information, time-tables and location (and for a view of additional installations, please visit www.lightinjerusalem.org.il ).
Merav (Salush) Eitan & Gaston Zahr
O*GE Architects
www.oge-architects.com
Enchanting Night Garden: Technical Details
5 Lotus Flowers, with a diameter of 4.2m, which blossom every 2 minutes
8 Tulips, 2.25m in height
120 Dewdrop Flowers, 0.25m1.20m in height
Four Solar Panels, which produce 720 watts per hour
156 LEDs of 1W-3W/24W
Credits
Concept, Design & Execution:
O*GE Architects – Merav (Salush) Eitan & Gaston Zahr
With Itzhak Salman, Haim Serfaty, Deri Plosner
www.oge-architects.com
www.oge-gallery.com
Client
Israel Electric Corporation – www.iec.co.il
Ariel Production Company, Jerusalem – www.ariel-jer.org.il
LED Lighting
Eyal and Shachar from Yair Doram – Culture of Light – www.yairdoram.com
Solar Panels & Solar Installation
GreenTops – www.greentops.co.il
Music
Ravid Hang – Ravid Goldschmidt – www.ravidhang.com / www.quantumevolution.co.uk
Hangover – Hang Solo Improvisation – Andy Isler (Switzerland) – www.musick.ch
Performance
Adi Burstein, Daniel Rivakov
Duration : 0:1:46