zenithal

Eight columns surround the body of the church and the interior walls are decorated with zenithal paintings.

Gnomons (used generally for observing the path of the Sun and in particular zenithal passages) were found at this and other sites.

There, at a latitude of about 15 N, the Sun passes through zenith twice a year, and there are 260 days between zenithal passages.

The zenithal hourly rate of the Quadrantids is approximately 130 meteors per hour at their peak; it is also a very narrow shower.

It is an annual shower associated with the Marsden group of comets that peaks on 7 June with a maximum zenithal hourly rate of 54 meteors.

External parabolic collectors require proper heat insulation, double-glazed windows over the zenithal opening and roller blinds to reduce excessive lighting, glare and heat on sunny days.

Many fireballs, green-hued trails, and even some meteors that cast shadows were observed throughout the outburst, which had a maximum zenithal hourly rate of 200-300 meteors per hour.

In 2004 researchers at the University of Oxford demonstrated two new types of zero-power bistable LCDs based on Zenithal bistable techniques.

The predictions of a shower less spectacular than the 1998 showing were borne out in a display that had a maximum zenithal hourly rate of 16-20 meteors per hour that night.

The zenithal bistable device (ZBD), developed by QinetiQ (formerly DERA), can retain an image without power.

The zenithal hourly rate of this shower can be as high as two other reliably rich meteor showers, the Perseids in August and the Geminids in December.

It was then suggested that it would be built in Lisbon, a place across the European continent where it was possible to make observations of that star of Argelander using a zenithal telescope.

The Sigma Arietids, a class IV meteor shower, are visible from 12 to 19 October, with a maximum zenithal hourly rate of less than two meteors per hour on 19 October.

Mounted behind the plate is a star-planisphere, based on a north pole stereographic zenithal projection (a projection from the north pole onto a plane passing through the south pole and perpendicular to the solar axis).

Coupled with the zenithal achievements of the Voyagers, came the end of manned spacecraft on the part of NASA, with termination of the Apollo lunar flights in 1972 with Apollo 17.

Unable to account for this, in a mounting excitement he stared more intently than ever, and was suddenly seized by the unnatural idea that he was peering downward into a vast, vertiginous abyss, rather than toward the zenithal heavens.

In astronomy, the Zenithal Hourly Rate (ZHR) of a meteor shower is the number of meteors a single observer would see in one hour under a clear, dark sky (limiting apparent magnitude of 6.5) if the radiant of the shower were at the zenith.

The Andromedids were associated with the most spectacular meteor showers of the 19th century; the storms of 1872 and 1885 were estimated to have a peak rate of two meteors per second (a zenithal hourly rate of 10,000), prompting one Chinese astronomer to compare the meteors to falling rain.

Azimuthal or Zenithal projections can be thought of in terms of the projection of the lines of latitude and longitude on the globe onto a fiat sheet of paper which touches the globe at some point (for example, the north or south pole in the case of Polar Azimuthal projections).