Rumors of the demise of this blog have been greatly exaggerated.
Although it is true that I have not posted anything here in quite some time.
My friend Rob Watson, the head of EcoTech International, has a saying Mother Nature that goes like this:Mother Nature is just chemistry, biology and physics. That's all she is.And because of that, says Rob, you cannot spin Mother Nature. You cannot sweet talk her, and you cannot ignore her. She's going to do with the climate whatever chemistry, biology and physics dictate. And Mother Nature always bats last, and she always bats a thousand.
Mother Nature bats last; that phrase can be traced to bumper stickers for the ecology movements such as Earth First!, and [probably] to ecologist Paul Ehrlich. Some of the appearances of the phrase add the note that
Nature is the home team.
friendly competitionthat occurs in some places and campgrounds, with two groups that come from different areas for a regular contest. This is an aggressive, in-your-face conflict, with shouting, threats, and occasional fisticuffs.
traditional, a D-section longbow, wooden arrows, hip quiver, leather bracer, leather archer's glove. The arrows are not target arrows, but rather have diamond-shaped hunting heads. These are the arrows that I have with me, so these are the arrows that I will use.
Note: The writer is in North America, and is writing primarily about conventions in North America using American English for this post. If and when I get more information on this particular topic in other cultures, I will add that to the series.
nightfallor
sunsetmay not be saying the same thing.
unequal hourstime systems have to have an agreement on just what that means.
sundownin some areas). This is, from the term, the time of day when the sun, well, sets. As a point in time,
sunsetis usually defined as that time of the day when the sun's trailing edge disappears below the horizon at the end of the daylight period.
daytime, not the center of the sun's disk, that means that at the Vernal and Autumnal Equinox, when the path of the Sun crosses the equatorial plane of the Earth, the defined period of daylight, using the definitions of
sunsetand
sunriseabove, is actually slightly longer than the defined period of darkness.
belowthe horizon due to refraction of light in the atmosphere, and again, the day when observed daylight and nighttime are the same length does not fall on the equinox.
twilight. In the morning, twilight begins at
dawn, and in the evening, twilight ends at
dusk.
dawnand
dusk? There are three common definitions in use.
Civilor
civilian twilight: That period of time between when the center of the sun's disk is less than 6° below the horizon and the upper limb of the sun's disk is visible above the horizon (sunrise/sunset). The beginning of the morning twilight is called
civil dawnand ends at sunrise, and the end of the evening twilight period is called
civil duskand begins at sunset. It is also sometimes referred to as the elapsed half hour before sunrise and the elapsed half hour after sunset, for simplicity's sake.
Nautical twilight: That period of time between when the center of the sun's disk is less than 12° below the horizon but greater than or equal to 6° below the horizon. The beginning of the morning twilight period is called
nautical dawnand the end of the evening twilight period is called
nautical dusk.
Astronomical twilight: That period of time between when the center of the sun's disk is less than 18° below the horizon but greater than or equal to 12° below the horizon. The beginning of the morning twilight period is called
astronomical dawnand the end of the evening twilight period is called
astronomical dusk.
roomsvary in size, from small courtyards to larger yards suitable for great gatherings, with the wind flattening the grass. The walls also vary, from strictly regimented, evenly spaced areas, to more haphazard, wandering paths and uneven rooms. The walls in the more strictly regimented areas appear to be less structurally sound and newer; the uneven areas are older, made in the more distant past.
NOTE: I will be continuing my posts on our methods of measuring time, but wanted to write on a different topic first. I will probably be doing that during my entire "Nature of Time" series.
Time passes.
hourin western culture.
mean solar hour, which is 1/24th of the length of the mean solar day (solar days actually vary in length during the year). We understand that the hour has 60 minutes, and that each minute has 60 seconds in it. We're taught this in school (at least the part about 60 minutes and 60 seconds, and 24 hours in the day), and might learn later that there are atomic clocks out there that measure and report a fixed, precise time that at least the U.S. government agrees on (my computer has a program that synchronizes the computer's clock to one of those atomic clocks). The day begins at midnight, and the hours run from 1 to 12 to reach noon, and then from 1 to 12 again to reach midnight (unless you're using a 24 hour clock as the military and some computer centers do. Oh, and Hong Kong as well).
hour, historically and currently, for taking measurements and recording events.
unequal hoursthat goes back a long time. Under this concept, the periods of daylight and darkness are each divided up into a predetermined number of units (called
hoursin western culture for convenience), and because the period of daylight and period of darkness may be of different lengths, the hours of daylight may be different lengths from the hours of darkness.
hourwas applied to the
Canonical Hours, the marking of when to perform particular sets of prayers in the various Christian churches, such as Prime (first hour of daylight), Terce/Tierce (third hour of daylight), Sext (sixth hour of daylight/midday), None[s] (ninth hour of daylight). We still keep one of those words in common use, None[s] (
noon), although it's been moved up to midday from its later position). The hours of nighttime were divided into a set number of Watches, Vigils, or Nocturnes, depending on the convention in use.
houris also applied to the
Planetary Hours, which is used to determine which of the seven planets (Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon) govern a particular time of day, so that you can know what hour a particular activity is best performed during. As with many mathematical concepts these days, there are websites, spreadsheets, and computer programs available that can help you determine exactly when these planetary hours fall on a given date.
Italiansystem starts the day at either nightfall or sunset (not necessarily considered the same time), the
Babylonianconsiders the day to start at daybreak or sunrise, and the so-called
Localsystem considers the day to start at local midnight (the modern system), all either for equal or unequal hours.
hour, as either an equal division of the mean solar day, or an unequal division of daylight versus nighttime. The major difference is that, traditionally, the total number of divisions in a day is 12, rather than 24. The Japanese hour system, further, counts backwards from 9 to 4 for the first half of the day, and again from 9 to 4 for the second half of the day (1 to 3 are reserved for religious reasons, the number of bell strokes to call Buddhists to prayer). I have seen a picture of a Japanese 12-hour clock, but it is a full day clock, not a half day clock like most western clocks.