Red Time Ball on top of Flamsteed House, one of the world's first visual time signals. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35881.html Lick obervatory, late afternoon. San Jose, California, USA http://www.terragalleria.com/california/picture.usca34932.html Telescopes, clouds, and fog at sunset. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49616.html Maui Space Surveillance Complex, Haleakala observatories. Maui, Hawaii, USA http://www.terragalleria.com/pacific/maui/maui-upcountry/picture.hawa49727.html Portland observatory. Portland, Maine, USA http://www.terragalleria.com/america/maine/portland-maine/picture.usme46047.html Observatory atop Red Hill. Haleakala National Park, Hawaii, USA. http://www.terragalleria.com/parks/np-image.hale6076.html Camera Obscura, Cliff House. San Francisco, California, USA http://www.terragalleria.com/california/picture.usca43358.html Shepherd 24-hour gate clock, and public standard of length, Royal Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35886.html Lick obervatory, late afternoon, Mount Hamilton. San Jose, California, USA http://www.terragalleria.com/california/picture.usca34933.html Summit observatory complex. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49631.html Camera Obscura interior, Cliff House. San Francisco, California, USA http://www.terragalleria.com/california/picture.usca43355.html Greenwich Park and Royal Observatory, late afternoon. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35891.html Dome housing the refractive telescope, Lick obervatory. San Jose, California, USA http://www.terragalleria.com/california/picture.usca34934.html Summit observatories. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49636.html Tourists look at moving image of ocean inside the Camera Obscura, Cliff House. San Francisco, California, USA http://www.terragalleria.com/california/picture.usca43352.html Royal Greenwich Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35880.html Lick observatory domes. San Jose, California, USA http://www.terragalleria.com/california/picture.usca51106.html Telescopes and stars at nightfall. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49618.html Old Royal Naval College, Queen's house, and Royal observatory with laser marking the Prime meridian at night. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35908.html Lick Refractor (third-largest refracting telescope in the world). San Jose, California, USA http://www.terragalleria.com/california/picture.usca51058.html Caltech Submillimeter Telescope, James Clerk Maxwell Telescope, and submillimeter Array. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49632.html Royal Greenwich Observatory, late afternoon. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35888.html Antique refracting 36 inch telescope. San Jose, California, USA http://www.terragalleria.com/california/picture.usca51056.html Gemini Northern Telescope and Canada-France Telescope. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49614.html University of California Lick Observatory at sunset. San Jose, California, USA http://www.terragalleria.com/california/picture.usca51062.html Recent snow and telescopes at sunset. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49613.html Flamsteed House with the Red Time Ball. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35882.html Lick telescope. San Jose, California, USA http://www.terragalleria.com/california/picture.usca51055.html United Kingdom Infrared Telescope and stars. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49622.html Daffodils on hillside, Royal Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35889.html Great Lick Refractor. San Jose, California, USA http://www.terragalleria.com/california/picture.usca51057.html Mauna Kea observatories at night. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49620.html Flamsteed House designed by Christopher Wren, Royal Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35890.html Observatories at dusk. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49617.html Refractive telescope, Lick obervatory. San Jose, California, USA http://www.terragalleria.com/california/picture.usca34928.html Royal Greenwich Observatory and daffodils. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35879.html Antenna on volcano top above clouds. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49623.html Telescope and Dome, Lick Observatory. San Jose, California, USA http://www.terragalleria.com/california/picture.usca10085.html Royal Observatory, the first purpose-built scientific research facility in Britain. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35883.html Observatories and recent snow. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49635.html Royal Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35878.html Radio telescope and clouds. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49625.html Greenwich meridian, or Prime meridian, the basis of Longitude, Royal Observatory. Greenwich, London, England, United Kingdom http://www.terragalleria.com/europe/london/maritime-greenwich/picture.uken35887.html Telescopes and star trails. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49619.html Subaru Telescope and Keck Observatory. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49633.html Inside Keck Observatory. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49634.html Astronomic radio antenna and sea of clouds. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49624.html Telescopes and stars at night. Mauna Kea, Big Island, Hawaii, USA http://www.terragalleria.com/pacific/hawaii-big-island/mauna-kea/picture.hawa49621.html