You observe the planet Jupiter at a sextant...

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Question 1 of 2066636eea28f7522a1c51b415

You observe the planet Jupiter at a sextant altitude (hs) of 66° 27.6' on 26 May. The index error is 5.2' on the arc. The height of eye is 52 feet. What is the observed altitude (Ho)?

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Question 1 of 20

66636eea28f7522a1c51b415

You observe the planet Jupiter at a sextant altitude (hs) of 66° 27.6' on 26 May. The index error is 5.2' on the arc. The height of eye is 52 feet. What is the observed altitude (Ho)?

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🔍 Key Concepts

• Index error (IE) correction: how to apply "on the arc" vs "off the arc" • Dip (height of eye) correction: why it is always subtracted from hs • Using the Nautical Almanac altitude correction tables for planets to go from apparent altitude (Ha) to observed altitude (Ho)

💭 Think About

• First, convert the sextant altitude (hs) to apparent altitude (Ha) by correctly applying the index error and dip. Think carefully about the sign of each correction. • Next, think about what kind of body Jupiter is considered for sight reduction tables and what standard correction you would expect (roughly) at an altitude around 66°. Should it make Ho slightly larger or smaller than Ha? • Compare your step‑by‑step corrected value with the choices and see which one is consistent with both the direction and typical size (in minutes) of the total corrections.

✅ Before You Answer

• Be sure you know that "on the arc" index error is subtracted from hs, and "off the arc" index error is added. • Confirm the dip correction for a height of eye of 52 feet from the dip table (it should be a little over 6 minutes). • After applying IE and dip, verify that your planet correction from the Nautical Almanac is of a reasonable magnitude for that altitude (on the order of a few minutes, not tens of minutes).

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Question 1 of 2066636eea28f7522a1c51b415

You observe the planet Jupiter at a sextant altitude (hs) of 66° 27.6' on 26 May. The index error is 5.2' on the arc. The height of eye is 52 feet. What is the observed altitude (Ho)?

Back

Question 1 of 20

66636eea28f7522a1c51b415

You observe the planet Jupiter at a sextant altitude (hs) of 66° 27.6' on 26 May. The index error is 5.2' on the arc. The height of eye is 52 feet. What is the observed altitude (Ho)?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed