皆既日食 - Total Solar Eclipse - 4月8日（月）= April 8 (Monday)
皆既日食 - Total Solar Eclipse - 4月8日（月）= April 8 (Monday)
NobbyM Mon Mar 25, 2024 9:13 pm
(English version is after the Japanese version)
皆さん、
ご存じの通り、皆既日食の帯が4月8日（月）午後Ontario州南部を横断します。
Torontoはわずかに皆既日食から外れますが、すぐ南の近くの町々はその帯に入ります。
その時間帯は下記の通り。
もう何度もmediaを通して警告されている通り、ほんのちょっとの太陽光の漏れでも
直接見る事は危険です。
【皆既日食の前後を見る為の特殊な眼鏡】
信用できる販売会社のISO12312-2 Filters for direct observation of the sun仕様の物。
それ以外にいろいろ言われている物は避けた方が良いでしょう。
【間接的に見る：ピンホールカメラを自作】
我が家の自作ピンホールカメラ。
[] 長い長方形の箱を選ぶ（この例は65cm)。
[] 光が漏れぬよう四方をtapeでしっかり固定。
[] 丸い穴を一方の端にあける。
[] Aluminum foilをその上にtapeで固定。
[] 裁縫用の針で穴をあける。太さを2種類使ってみた。
[] 箱の反対側の側面に覗く四角い穴をあける。
[] 底の内側に白い紙を貼り付ける。
[] 晴れた日に太陽光線を白い紙に投射してテストしてみる。
[] 完成。
これは2017年8月の70%部分日食の時の自作ピンホールカメラの映像。
その他にも、このように。
【間接的に見る：自然界のピンホールカメラ】
木々やbushや垣根の葉の重なりの小さな隙間がすべてピンホールカメラとなります。
段ボール紙などしっかりした平たい物に木漏れ日を投射してみましょう。
下は2017年8月の70%部分日食の時の歩道に出来た木漏れ日ピンホールカメラの映像。
路面をゆらゆら揺れる無数の部分食は直接見るよりもはるかに美しかったです。
【皆既日食100%の観測：非常に重要】
皆既日食になった途端、上記日食観測用メガネでは何も見えなくなります。
つまり目に危険な紫外線など波長の短い強い光が届かなくなります。
この皆既日食100%の間は眼鏡なしで見る事が出来ます、
皆既日食の最中は真っ黒な月の縁から美しいコロナが吹き出します。
このコロナは日食観測用眼鏡を通しては見られません。
コロナを見る為には皆既日食の帯の中に完全にいる事が必要です。
Torontoのようにちょっとでも外れていたら危険です。
また、時間的にも皆既日食から少しでも外れたら危険です。
皆既日食中の美しいコロナを見るには場所と時間の十分な注意が必要です。
【写真撮影】
皆既日食の最中以外にカメラを直接太陽に向ける事はカメラにも危険です。
日食観測用メガネでカメラレンズを覆うなど眼を注意するのと同じ注意をしましょう。
【Spoiler Alert (皆既日食台無し警告)】
天候ばかりはどうしようもないですね。
曇りでも不思議な感じで暗くなっていく経験は出来ます。
【日食の一口解説】
いろいろな意味で人類は幸運な時期に地球上に存在しています。日食もそのひとつです。
日食とは月が太陽と地球の間に入って、月が太陽を隠す現象です。46億年前に月が出来た時は月と地球との距離は今の20分の１で、月は４時間で地球を一回りしていました。地球から見る月は巨大で、太陽を何回も隠したことでしょう。それ以後月は地球から徐々に遠のいて行き、月の見かけの大きさが太陽と同じになって現在のような日食が見られるようになったのは1億5000万年前、恐竜が地球上に現れた頃からです。そして今から1億5000万年後には月が地球から離れすぎてこういう日食も見られなくなります。つまり人類は月と太陽の大きさが全く同じである完璧な時期に存在し、美しい日食現象を楽しむ贅沢を味わっていることになります。
昔の人々にとってこれは恐ろしい現象でした。太陽が神であった民族にとって、日食は神の怒りの現われに他ならなかった。日本神話の天照大神（あまてらすおおみかみ）が岩戸に隠れて皆を困らせた話は皆既日食のことでしょう。
月の軌道は完全な円ではありません。ちょっと楕円になっています。その、月の地球からの微妙な位置のずれによって皆既日食とか金環食が起こります。皆既日食は月が太陽と完全に重なり、太陽表面から噴き出す美しいコロナ現象が見られます。金環食は月がちょっと遠い位置にあり、太陽の縁が月の黒い影の周りにはみ出し「火の輪」となって見えます。
トロントでは1994年5月10日に金環食がありました。
皆既日食で暗くなるのは夕方から暗くなるのとはかなり違う経験となるでしょう。「暗くなる」というよりは「灰色が濃くなって行く」と感じました。
皆既日食中は気を付けてみると明るい星が見える事があります。事実、1919年にEddington博士が皆既日食を利用してその縁近くの星の位置が通常の位置からわずかにずれている事を観測、Einsteinの相対性理論の、（月の）重力が光を曲げる事を証明しました。
太陽光線の中の青色系統から紫外線への波長の短い光は目にも皮膚にも危険です。でもなぜ朝日や夕日は比較的大丈夫なのか。それは上空から来る光に比べ、朝日・夕日の光は地面に沿って大気の中を長い距離を通して来る為、短い波長の光は大気中の空気分子に当たって散らばってしまいます。長い波長の赤系統の光はなかなか散らばりません。朝日・夕日が赤みがかって見えるのはそのせいです。
======================================
Folks,
As you know, a band of total solar eclipse will cross southern Ontario in the afternoon of Monday, April 8th.
Toronto will be slightly out of the band. But nearby towns just to the south will be in the band.
The time periods in these places are as follows.
As has been warned many times through the media, It is dangerous to look directly at even a small amount of sunlight.
[Special glasses to observe before and after the total solar eclipse]
Pairs of glasses that conform to ISO12312-2 "Filters for direct observation of the sun" from reliable manufacturers / suppliers.
It would be wise to avoid anything else.
[Indirect view method: Make your own pinhole camera]
My homemade pinhole camera.
[] Choose a long rectangular box (65cm long in this example).
[] Secure on all sides with tapes to prevent light from penetrating into the box.
[] Make a round hole on one end.
[] Cover the hole with a sheet of aluminum foil with tape.
[] Make a tiny hole or two with sewing needles. I used two different sizes.
[] Make a rectangular opening in the side wall at the opposite end for viewing.
[] Paste a sheet of white paper on the bottom inside as a screen.
[] Test on a sunny day. Project the sunlight on the white sheet.
[] Complete.
This is an image made in my homemade pinhole camera during the 70% partial solar eclipse in August 2017.
Other methods, like these.
[Indirect viewing method: pinhole camera in nature]
Every small gap between the overlapping leaves of trees, bushes and hedges becomes a pinhole camera.
Try projecting sunlight filtering through the trees, bushes and hedges onto a sturdy, flat object such as a cardboard sheet.
Below is an image on the sidewalk made by natural pinhole cameras through the tree leaves during the 70% partial solar eclipse in August 2017.
The countless partial eclipse images swaying by wind across the sidewalk were more beautiful than seeing the real thing.
[Observation of 100% total solar eclipse: Very important]
As soon as a total solar eclipse occurs, you will not see anything through the eclipse viewing glasses mentioned above.
In other words, strong sunlight with short wavelengths such as ultraviolet rays that are dangerous to the eyes will not reach your eyes.
Thus, during this 100% total solar eclipse, you can see it without glasses.
During a total solar eclipse, beautiful coronas erupt from the edge of the black moon.
The coronas cannot be seen through eclipse viewing glasses.
To see the corona, you need to be completely within the band of and within the time period of the total solar eclipse.
If you are slightly off from the band, like in Toronto, and the time period, it's dangerous to your eyes to see without glasses.
[Photo shoot]
Pointing your camera directly at the sun other than during a total solar eclipse is dangerous for your camera as well.
Take the same precautions as you would take with your eyes, such as covering the camera with observing glasses.
[Spoiler Alert]
There's nothing we can do about the weather.
However, even on a cloudy day, you can experience a strange feeling of getting dark.
[A quick talk on solar eclipses]
In many ways, humans are at a fortunate time period in the history of the earth. Solar eclipses are one of them.
A solar eclipse is a phenomenon in which the moon enters between the sun and the earth, and the moon hides the sun.
When the moon was formed 4.6 billion years ago, the distance between the moon and the earth was 1/20th of what it is now. The moon orbited the earth in 4 hours. The moon then, seen from the earth, was so huge that it must have covered the sun many times.
Since then, the moon has gradually moved away from the earth. Eventually the apparent size of the moon became the same as the sun.
The solar eclipse we see today began 150 million years ago, when dinosaurs appeared on earth.
In the future, 150 million years from now, the moon will be so far away from the earth that we will no longer be able to see solar eclipses like this anymore.
This means that humanity exists in a perfect period when the moon and sun are exactly the same size, and we have the luxury of enjoying beautiful solar eclipse phenomena.
In the past, this was a frightening phenomenon for humans. For people whose god was the sun, solar eclipses were nothing but a manifestation of God's wrath.
In Japanese mythology, the story of a God Amaterasu Omikami hiding in a cave and causing trouble to everyone was probably a total solar eclipse.
The moon's orbit is not a perfect circle. It's a little oval. Total solar eclipses and annular eclipses occur due to subtle shifts in the moon's position from the Earth. During a total solar eclipse, the moon completely overlaps with the sun, creating the beautiful corona phenomenon that erupts from the sun's surface. During an annular eclipse, the moon is a little far away, and the edge of the sun protrudes around the moon's dark circle, creating a "ring of fire."
There was an annular eclipse in Toronto on May 10, 1994.
Getting dark during a total solar eclipse will be a different experience than getting dark in the evening. Rather than "getting darker", I felt it was "gray colour getting thicker".
During a total solar eclipse, you may be able to see bright stars. In fact, in 1919, Dr. Eddington used a total solar eclipse to observe the positions of stars near the edge of the solar eclipse. He found that they were slightly shifted from their normal positions. It showed that (moon's) gravity bent the light from the stars, confirming that Einsteins' General Relativity was correct.
The short wavelength sunlight from the blue to ultraviolet is dangerous to the eyes and skin. But why are sunrises and sunsets relatively safe to watch? Compared to the sunlight that comes from the sky above, the sunlight of the sunrise and sunset travels a long distance along the ground through the atmosphere. So sunlight with short wavelengths hits air molecules in the atmosphere and is scattered. Red light with long wavelengths does not easily scatter. This is why the sunrise and sunset appear reddish.
Nobby Miura P.Eng., M.Eng.
nobbycosmic@gmail.com
皆さん、
ご存じの通り、皆既日食の帯が4月8日（月）午後Ontario州南部を横断します。
Torontoはわずかに皆既日食から外れますが、すぐ南の近くの町々はその帯に入ります。
その時間帯は下記の通り。
もう何度もmediaを通して警告されている通り、ほんのちょっとの太陽光の漏れでも
直接見る事は危険です。
【皆既日食の前後を見る為の特殊な眼鏡】
信用できる販売会社のISO12312-2 Filters for direct observation of the sun仕様の物。
それ以外にいろいろ言われている物は避けた方が良いでしょう。
【間接的に見る：ピンホールカメラを自作】
我が家の自作ピンホールカメラ。
[] 長い長方形の箱を選ぶ（この例は65cm)。
[] 光が漏れぬよう四方をtapeでしっかり固定。
[] 丸い穴を一方の端にあける。
[] Aluminum foilをその上にtapeで固定。
[] 裁縫用の針で穴をあける。太さを2種類使ってみた。
[] 箱の反対側の側面に覗く四角い穴をあける。
[] 底の内側に白い紙を貼り付ける。
[] 晴れた日に太陽光線を白い紙に投射してテストしてみる。
[] 完成。
これは2017年8月の70%部分日食の時の自作ピンホールカメラの映像。
その他にも、このように。
【間接的に見る：自然界のピンホールカメラ】
木々やbushや垣根の葉の重なりの小さな隙間がすべてピンホールカメラとなります。
段ボール紙などしっかりした平たい物に木漏れ日を投射してみましょう。
下は2017年8月の70%部分日食の時の歩道に出来た木漏れ日ピンホールカメラの映像。
路面をゆらゆら揺れる無数の部分食は直接見るよりもはるかに美しかったです。
【皆既日食100%の観測：非常に重要】
皆既日食になった途端、上記日食観測用メガネでは何も見えなくなります。
つまり目に危険な紫外線など波長の短い強い光が届かなくなります。
この皆既日食100%の間は眼鏡なしで見る事が出来ます、
皆既日食の最中は真っ黒な月の縁から美しいコロナが吹き出します。
このコロナは日食観測用眼鏡を通しては見られません。
コロナを見る為には皆既日食の帯の中に完全にいる事が必要です。
Torontoのようにちょっとでも外れていたら危険です。
また、時間的にも皆既日食から少しでも外れたら危険です。
皆既日食中の美しいコロナを見るには場所と時間の十分な注意が必要です。
【写真撮影】
皆既日食の最中以外にカメラを直接太陽に向ける事はカメラにも危険です。
日食観測用メガネでカメラレンズを覆うなど眼を注意するのと同じ注意をしましょう。
【Spoiler Alert (皆既日食台無し警告)】
天候ばかりはどうしようもないですね。
曇りでも不思議な感じで暗くなっていく経験は出来ます。
【日食の一口解説】
いろいろな意味で人類は幸運な時期に地球上に存在しています。日食もそのひとつです。
日食とは月が太陽と地球の間に入って、月が太陽を隠す現象です。46億年前に月が出来た時は月と地球との距離は今の20分の１で、月は４時間で地球を一回りしていました。地球から見る月は巨大で、太陽を何回も隠したことでしょう。それ以後月は地球から徐々に遠のいて行き、月の見かけの大きさが太陽と同じになって現在のような日食が見られるようになったのは1億5000万年前、恐竜が地球上に現れた頃からです。そして今から1億5000万年後には月が地球から離れすぎてこういう日食も見られなくなります。つまり人類は月と太陽の大きさが全く同じである完璧な時期に存在し、美しい日食現象を楽しむ贅沢を味わっていることになります。
昔の人々にとってこれは恐ろしい現象でした。太陽が神であった民族にとって、日食は神の怒りの現われに他ならなかった。日本神話の天照大神（あまてらすおおみかみ）が岩戸に隠れて皆を困らせた話は皆既日食のことでしょう。
月の軌道は完全な円ではありません。ちょっと楕円になっています。その、月の地球からの微妙な位置のずれによって皆既日食とか金環食が起こります。皆既日食は月が太陽と完全に重なり、太陽表面から噴き出す美しいコロナ現象が見られます。金環食は月がちょっと遠い位置にあり、太陽の縁が月の黒い影の周りにはみ出し「火の輪」となって見えます。
トロントでは1994年5月10日に金環食がありました。
皆既日食で暗くなるのは夕方から暗くなるのとはかなり違う経験となるでしょう。「暗くなる」というよりは「灰色が濃くなって行く」と感じました。
皆既日食中は気を付けてみると明るい星が見える事があります。事実、1919年にEddington博士が皆既日食を利用してその縁近くの星の位置が通常の位置からわずかにずれている事を観測、Einsteinの相対性理論の、（月の）重力が光を曲げる事を証明しました。
太陽光線の中の青色系統から紫外線への波長の短い光は目にも皮膚にも危険です。でもなぜ朝日や夕日は比較的大丈夫なのか。それは上空から来る光に比べ、朝日・夕日の光は地面に沿って大気の中を長い距離を通して来る為、短い波長の光は大気中の空気分子に当たって散らばってしまいます。長い波長の赤系統の光はなかなか散らばりません。朝日・夕日が赤みがかって見えるのはそのせいです。
======================================
Folks,
As you know, a band of total solar eclipse will cross southern Ontario in the afternoon of Monday, April 8th.
Toronto will be slightly out of the band. But nearby towns just to the south will be in the band.
The time periods in these places are as follows.
As has been warned many times through the media, It is dangerous to look directly at even a small amount of sunlight.
[Special glasses to observe before and after the total solar eclipse]
Pairs of glasses that conform to ISO12312-2 "Filters for direct observation of the sun" from reliable manufacturers / suppliers.
It would be wise to avoid anything else.
[Indirect view method: Make your own pinhole camera]
My homemade pinhole camera.
[] Choose a long rectangular box (65cm long in this example).
[] Secure on all sides with tapes to prevent light from penetrating into the box.
[] Make a round hole on one end.
[] Cover the hole with a sheet of aluminum foil with tape.
[] Make a tiny hole or two with sewing needles. I used two different sizes.
[] Make a rectangular opening in the side wall at the opposite end for viewing.
[] Paste a sheet of white paper on the bottom inside as a screen.
[] Test on a sunny day. Project the sunlight on the white sheet.
[] Complete.
This is an image made in my homemade pinhole camera during the 70% partial solar eclipse in August 2017.
Other methods, like these.
[Indirect viewing method: pinhole camera in nature]
Every small gap between the overlapping leaves of trees, bushes and hedges becomes a pinhole camera.
Try projecting sunlight filtering through the trees, bushes and hedges onto a sturdy, flat object such as a cardboard sheet.
Below is an image on the sidewalk made by natural pinhole cameras through the tree leaves during the 70% partial solar eclipse in August 2017.
The countless partial eclipse images swaying by wind across the sidewalk were more beautiful than seeing the real thing.
[Observation of 100% total solar eclipse: Very important]
As soon as a total solar eclipse occurs, you will not see anything through the eclipse viewing glasses mentioned above.
In other words, strong sunlight with short wavelengths such as ultraviolet rays that are dangerous to the eyes will not reach your eyes.
Thus, during this 100% total solar eclipse, you can see it without glasses.
During a total solar eclipse, beautiful coronas erupt from the edge of the black moon.
The coronas cannot be seen through eclipse viewing glasses.
To see the corona, you need to be completely within the band of and within the time period of the total solar eclipse.
If you are slightly off from the band, like in Toronto, and the time period, it's dangerous to your eyes to see without glasses.
[Photo shoot]
Pointing your camera directly at the sun other than during a total solar eclipse is dangerous for your camera as well.
Take the same precautions as you would take with your eyes, such as covering the camera with observing glasses.
[Spoiler Alert]
There's nothing we can do about the weather.
However, even on a cloudy day, you can experience a strange feeling of getting dark.
[A quick talk on solar eclipses]
In many ways, humans are at a fortunate time period in the history of the earth. Solar eclipses are one of them.
A solar eclipse is a phenomenon in which the moon enters between the sun and the earth, and the moon hides the sun.
When the moon was formed 4.6 billion years ago, the distance between the moon and the earth was 1/20th of what it is now. The moon orbited the earth in 4 hours. The moon then, seen from the earth, was so huge that it must have covered the sun many times.
Since then, the moon has gradually moved away from the earth. Eventually the apparent size of the moon became the same as the sun.
The solar eclipse we see today began 150 million years ago, when dinosaurs appeared on earth.
In the future, 150 million years from now, the moon will be so far away from the earth that we will no longer be able to see solar eclipses like this anymore.
This means that humanity exists in a perfect period when the moon and sun are exactly the same size, and we have the luxury of enjoying beautiful solar eclipse phenomena.
In the past, this was a frightening phenomenon for humans. For people whose god was the sun, solar eclipses were nothing but a manifestation of God's wrath.
In Japanese mythology, the story of a God Amaterasu Omikami hiding in a cave and causing trouble to everyone was probably a total solar eclipse.
The moon's orbit is not a perfect circle. It's a little oval. Total solar eclipses and annular eclipses occur due to subtle shifts in the moon's position from the Earth. During a total solar eclipse, the moon completely overlaps with the sun, creating the beautiful corona phenomenon that erupts from the sun's surface. During an annular eclipse, the moon is a little far away, and the edge of the sun protrudes around the moon's dark circle, creating a "ring of fire."
There was an annular eclipse in Toronto on May 10, 1994.
Getting dark during a total solar eclipse will be a different experience than getting dark in the evening. Rather than "getting darker", I felt it was "gray colour getting thicker".
During a total solar eclipse, you may be able to see bright stars. In fact, in 1919, Dr. Eddington used a total solar eclipse to observe the positions of stars near the edge of the solar eclipse. He found that they were slightly shifted from their normal positions. It showed that (moon's) gravity bent the light from the stars, confirming that Einsteins' General Relativity was correct.
The short wavelength sunlight from the blue to ultraviolet is dangerous to the eyes and skin. But why are sunrises and sunsets relatively safe to watch? Compared to the sunlight that comes from the sky above, the sunlight of the sunrise and sunset travels a long distance along the ground through the atmosphere. So sunlight with short wavelengths hits air molecules in the atmosphere and is scattered. Red light with long wavelengths does not easily scatter. This is why the sunrise and sunset appear reddish.
Nobby Miura P.Eng., M.Eng.
nobbycosmic@gmail.com
NobbyM- Posts : 224
Join date : 2008-11-14
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