Compass Bearing: Finding Una's Position
- Learn how to find Una's position using compass bearing.
- Understand how to calculate the angle in a clockwise direction from the north line.
- Discover the meaning of the answer N56°W.
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bearing (質問英文です)
問題 Una travels due north for 50km. She then changes direction and travels due west for 75km. Find the compass bearing of Una's position now from her staring point. 答え N56°W このbearing を求めよ、という問題で考え方がよくわからないのです。 Bearing とは 「The bearing of a point is the number of degrees in the angle measured in a clockwise direction from the north line to the line joining the centre of the compass with the point.」 と認識しています。 という事はこの問題から求める角度は図ｂだと思うのですが答えは図aからです。 もしかしたらこの N56°W という答え方を私が知らないだけかな？とも思っています。 どなたか考え方を教えて頂けますか？
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＞angle measured in a clockwise direction あれ？clockwiseって書いてあるなぁ。 ふつう、角度のはかり方はcounterclockwiseなんですけどね。
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- tmpname
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例えば天文学では方位角(azumith)は普通に時計回りです（逆回りはいかにも不自然でしょう）。測地学でもそうっぽいです。で、bearingと言われたら時にはazumithと同じ意味で使われる事もありますが、もっと色んな所で使われます。 でも、まあN56°Wと答えるのはよいのでは無いでしょうか
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By the morning of 27 October this outpost line on the long ridge from el Buqqar to Hill 630, was held by the 1st County of London Yeomanry on the right, supported by the 21st Machine Gun Squadron, the 3rd County of London Yeomanry (Sharpshooters) on the left with the City of London Yeomanry (Rough Riders) in reserve north west of Kh. Khasif. One dismounted squadron of the regiment held Hill 630, three troops held Hill 720, and the post on el Buqqar was also garrisoned. They would be reinforced during the day by the 3rd Light Horse Brigade from the Australian Mounted Division with the 12th Light Armoured Motor Battery, the 158th (North Wales) Brigade and 160th (Wales) Brigade from the 53rd (Welsh) Division, the 229th Brigade from the 74th (Yeomanry) Division, accompanied by the 96th Heavy Artillery group (less 4 batteries) and the British "A" Battery from the 117th Field Artillery Brigade Battle Point 630 Detail of the el Girheir to el Buqqar defensive line At 04:10 on Saturday 27 October a post held by the 1st County of London Yeomanry to the west of Bir el Girheir on Point 630 was attacked by an Ottoman cavalry patrol "in great strength." About 05:30 the infantry and cavalry, estimated by a Royal Flying Corps reconnaissance aircraft to be a force of 2,000, attacked the outpost line, becoming heavily engaged on Hill 630, where the attack on both flanks was supported by heavy machine gun and artillery fire. At 06:48, the 8th Mounted Brigade reported Ottoman units attacking Point 630 and a hill 1.5 miles (2.4 km) to the south east, with an infantry battalion of the 158th Brigade (53rd Division) advancing towards Point 630, with one battalion and one battery at Sebil/Point 550. Two troops of 1st County of London Yeomanry ordered forward to the right of the post, advanced through heavy fire to find the post almost surrounded. A squadron of the City of London Yeomanry in reserve advanced, also under heavy fire, to occupy a position 200 yards (180 m) south of the threatened post and stopped the Ottoman forces from completely surrounding it. By 07:55 two, or more camel guns were seen approaching Point 630 from Bir Ifteis while the yeomanry garrisons on Point 630 continued to hold their ground.
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The naval operations in the Dardanelles campaign (17 February 1915 – 9 January 1916) took place against the Ottoman Empire during the First World War. Ships of the Royal Navy, French Marine nationale, Imperial Russian Navy (Российский императорский флот) and the Royal Australian Navy, attempted to force the defences of the Dardanelles Straits. The straits are a narrow waterway connecting the Mediterranean Sea with the Black Sea, via the Aegean, Sea of Marmara and the Bosphorus. The Dardanelles campaign began as a naval operation but the success of the Ottoman defence led to the Gallipoli campaign, an attempt to occupy the Gallipoli peninsula with land forces supported by the navies, to open the sea route to Constantinople. The Allies also tried to pass submarines through the Dardanelles to attack Ottoman shipping in the Sea of Marmara. The mouth of the strait is 2.3 mi (3.7 km) wide with a rapid current emptying from the Black Sea into the Aegean. The distance from Cape Helles to the Sea of Marmara is about 41 mi (66 km), overlooked by the heights on the Gallipoli peninsula and lower hills on the Asiatic shore. The passage widens for 5 mi (8.0 km) to Eren Keui Bay, the widest point of the strait at 4.5 mi (7.2 km), then narrows for 11 mi (18 km) to Kephez Point, where the waterway is 1.75 mi (2.82 km) wide and then broadens as far as Sari Sighlar Bay. The narrowest part of the strait is 14 mi (23 km) upstream, from Chanak to Kilid Bahr at 1,600 yd (1,500 m), where the channel turns north and widens for 4 mi (6.4 km) to Nagara Point. From the point, the passage turns north-east for the final 23 mi (37 km) to the Sea of Marmora. The Ottomans used the term "fortress" to describe the sea defences of the Dardanelles on both sides of the waterway from the Aegean approaches to Chanak. In 1914 only the defences from the entrance of the straits and 4 mi (6.4 km) from the north end of Kephez Bay to Chanak had been fortified. Until late October 1914, the nature of the seaward defences of the Dardanelles was known to the British and French but after hostilities commenced, information on improvements to the Ottoman fortifications became harder to obtain. The naval operations in the Dardanelles campaign ダーダネルス戦役
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At 10:00, the front held by the two light horse brigades faced south from a point 700 yards (640 m) northwest of No. 22 Redoubt north of Wellington Ridge to the sand hills north of Mount Royston. As the line had fallen back, the 2nd and 3rd Light Horse Regiments (1st Light Horse Brigade) had come in between the 6th and 7th Light Horse Regiments (2nd Light Horse Brigade); from right to left, the line was now held by the 6th, 3rd, 2nd and 7th Light Horse and the Wellington Mounted Rifles Regiments, while 1 mile (1.6 km) north north-west of Mount Royston, "D" Squadron of the Royal Gloucestershire Hussars (a regiment in the 5th Mounted Brigade) held its ground.
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調べてみると確かに同じ様なコメントが見つかりました。 http://okwave.jp/qa/q6288089.html が、英語版で調べるとやはりこの様に書いてあります。 http://answers.yahoo.com/question/index?qid=20090202134507AAFBeL3 答え方でclockwise 又は counterclockwiseと区別するのかな？と思い始めました。 何にせよ通常は「角度のはかり方はcounterclockwise」という事、勉強になりました、有難うございます。
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あれから自分なりにいろいろ調べましたがどうも回答の仕方が２通りある様です。 こちらでは直接ほしかった回答は得られませんでしたが（私の質問内容、仕方に問題有りなので）いつも沢山の方から親切にいろいろ教えて頂きとても感謝しています。 有難うございました、又宜しくお願い致します。