https://bugs.kde.org/show_bug.cgi?id=434991
Bug ID: 434991
Summary: Solar system units for days and years are inconsistent
(and wrong)
Product: gcompris
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jaz...@gmail.com
Reporter: k...@huftis.org
Target Milestone: ---
SUMMARY
The answers in the solar system activity have inconsistent units, and the
numbers don’t always correspond to the units used. Some questions use ‘days’,
others ‘Earth days’. Some questions use ‘years’, other ‘Earth years’. For the
questions that use ‘days’, the answer is actually wrong: The numbers listed
seem to correspond the number of Earth days, not the number of days. (Though I
haven’t checked all questions.)
For example, the question ‘How long is a year on Mercury?’ have the response
options in ‘days’ units, ‘365 days’, ‘433 days’, ‘88 days’ and ‘107 days’, with
‘88 days’ as the ‘correct’ answer. But the *actual* correct answer is ‘88 Earth
days’ (which is actually only 0.5 (solar) *day*, since Mercury spins so
incredibly slowly). Source:
https://solarsystem.nasa.gov/planets/mercury/in-depth/
On the other hand, the question ‘How long is one rotation on Mercury?’
(correctly) lists the response options in ‘Earth days’ units, with ‘59 Earth
days’ as the correct response.
(BTW, note that this is different than the ‘Day’ value listed on the NASA site.
The ‘Day’ is the number of *solar* days, i.e. the time needed for the sun to
return to the same place in the sky, which is 176 Earth days, but the planet
only needs ~59 Earth days to complete a rotation.)
The same hold for the ‘years’ value. This needs to be changed to ‘Earth years’.
(If not, the answer to all the questions would obviously all be ‘1 year’ …)
STEPS TO REPRODUCE
1. Launch the solary system activity.
2. Click on a planet.
3. Answer the questions until you get a ‘How long is one rotation on PLANET?’
or ‘How long does it take for PLANET to make one revolution around the Sun?’.
OBSERVED RESULT
Some response options are days, some Earth days, some years and some Earth
years.
EXPECTED RESULT
The only two response options should be Earth days and Earth years. (Except for
the questions about Earth itself; then they can be ‘days’. I think having
‘Earth days’ here would be confusing, though not incorrect.)
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