I actually used an old ‘British portable sundial’ over 130 years ago – Nazology

Victorian style portable sundial

What are the advantages of this product?

According to the information of the store from which you purchased, the estimated age of production is1850-1880 (mid to late 19th century)It seems who

At about 5cm in diameter, it is an easy-to-hold size and design that fits comfortably in your hand.

dial floats in liquid,A compass rotates according to the direction of the dial itselfIt became likely an oil-type compass also found in modern compass magnets.

Main articlecopperand the upper halfglass domeletter.

On the underside of the brass cap are the names of the 12 months and the correction amount for each period.

Because the sun’s elevation changes with the seasons, the same shadows aren’t always cast at the same time. Therefore, it is necessary to correct the reading time according to the season.

You can tell how many minutes to add or subtract by looking at the back of the lid.

Furthermore it,It is possible to stop the movement of the disc by moving the knob on the side of the main unit. It may be able to adjust when placed in a slightly unstable location or when used in different latitudes.

Additionally, if you search for “Edo sundial” to see what Japanese portable sundials were like from the same era, it looks like a sundial with a compass set (top right and center of image, sundial bottom right).

I am amazed at the high end design of this portable British made sundial.

What types of sundials are there?

The time is read from the position of the shadow on one side of the bar or triangle.scorpion)”it’s called.

There are different types of sundials, but this time we will introduce the horizontal type, vertical type, top type and column type that you may have seen before.

horizontal sundial

First of all, the portable sundial in this review ishorizontal sundialThe most common type of sundial is called.

contact facenodial plateA circular disk called horizontal (parallel to the ground), and triangularscorpionattached.

The scale on the disk is calculated using trigonometric functions, so it’s not even. There is an advantage that one unit can be used from sunrise to sunset.

vertical sundial

The next most popular watch is in Europevertical sundialHe is.

It is a type in which the dial is perpendicular to the ground and is fixed to the outer wall of the building.

It’s also painted on the wall of Grandpa’s shop in “Whisper of the Heart.”

I think I saw this vertical sundial when I went to the Nobeyama Observatory before.

The dial has uneven gradations, similar to a horizontal sundial, but it can only be used 12 hours a day.

Star Sommelier® is presented by the Nobeyama National Astronomical Observatory in Japan

Top sundial

Sundial in top shapeIt is, as its name suggests, a sundial whose shape resembles a peak.

It features a gnomon facing the celestial North Pole (the North Hemisphere’s North Star), a dial parallel to the equator, and an evenly distributed dial scale.

Depending on the position of the sun, the time is read from the shadows formed on the surface from the vernal equinox to the autumnal equinox, and from the shadows formed on the back side during the autumnal equinox.

column sundial

column sundialIt is a horizontal dial with a bar-shaped hand.

sundialHe was born in Egypt about 6,000 years agoIt is believed that time was measured by the position and length of the shadow of a stick held upright on the ground.

Therefore, the column-shaped sundial may be the closest to the prototype. It is said that the sundial in the shape of a column was also used in ancient Greece.

The subsequent sundial reads the time indicated by the tip of the gnomon’s shadow. Although the coding on the dial is messy, if you write the time line in advance according to the position of the sun that changes according to the season, you can read it as it is, and there is no need to correct the time.