---
title: Why can the Sun and the Moon look the same size in the sky? — Day and night, and the Moon's faces · tree and pragmatics
description: Why can the Sun and the Moon look the same size in the sky? Test 10 of lesson 39 «Day and night, and the Moon's faces» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 10 · Day and night, and the Moon's faces

<!-- .ven lang=en -->
Why can the Sun and the Moon look the same size in the sky?

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 2 · wrong ✗ · **Who acts:** Sun · **What happens:** look · **To what, where:** same size, sky

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This is test 10 of lesson 39 «Day and night, and the Moon's faces» of the physics course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/physics/39-day-and-night-and-the-moons-faces/#t10).

## The question {#question}

```conllu
# sent_id = question:physics:39-day-and-night-and-the-moons-faces:t10:1
# text = Why can the Sun and the Moon look the same size in the sky?
1	Why	why	ADV	WRB	PronType=Int	8	advmod	_	_
2	can	can	AUX	MD	VerbForm=Fin	4	aux	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	Sun	Sun	PROPN	NNP	Number=Sing	8	nsubj	_	_
5	and	and	CCONJ	CC	_	7	cc	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	Moon	Moon	PROPN	NNP	Number=Sing	4	conj	_	_
8	look	look	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
10	same	same	ADJ	JJ	Degree=Pos	11	amod	_	_
11	size	size	NOUN	NN	Number=Sing	8	obj	_	_
12	in	in	ADP	IN	_	14	case	_	_
13	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
14	sky	sky	NOUN	NN	Number=Sing	8	obl	_	SpaceAfter=No
15	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **look** | present | the Sun and the Moon | the same size |  | the sky |  |  | vn seem-109-1-1 «NP V NP»: agent=Theme size=Attribute |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The air makes them look the same

```conllu
# sent_id = question:physics:39-day-and-night-and-the-moons-faces:t10:o1:1
# text = The air makes them look the same
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	air	air	NOUN	NN	Number=Sing	3	nsubj	_	_
3	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	3	obj	_	_
5	look	look	VERB	VB	VerbForm=Inf	3	xcomp	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	same	same	ADJ	JJ	Degree=Pos	5	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | the air | them *= they* |  |  |  |  | tree rules |
| 2 | **look** | infinitive | them *= they* *not said here* | the same |  |  |  |  | vn seem-109-1-1 «NP V NP»: agent=Theme same=Attribute |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
The Sun is much bigger but also much further away

```conllu
# sent_id = question:physics:39-day-and-night-and-the-moons-faces:t10:o2:1
# text = The Sun is much bigger but also much further away
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Sun	Sun	PROPN	NNP	Number=Sing	5	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	much	much	ADV	RB	_	5	advmod	_	_
5	bigger	big	ADJ	JJR	Degree=Cmp	0	root	_	_
6	but	but	CCONJ	CC	_	10	cc	_	_
7	also	also	ADV	RB	_	8	advmod	_	_
8	much	much	ADV	RB	_	9	advmod	_	_
9	further	far	ADV	RBR	Degree=Cmp	10	advmod	_	_
10	away	away	ADV	RB	_	5	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the Sun |  |  |  |  | big *property* | tree rules |

### Option 3 · ← Mova's choice {#o3}

<!-- .ven lang=en -->
The Moon is bigger than the Sun

```conllu
# sent_id = question:physics:39-day-and-night-and-the-moons-faces:t10:o3:1
# text = The Moon is bigger than the Sun
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Moon	Moon	PROPN	NNP	Number=Sing	4	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	bigger	big	ADJ	JJR	Degree=Cmp	0	root	_	_
5	than	than	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	Sun	Sun	PROPN	NNP	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the Moon |  |  |  |  | than the Sun; big *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
They really are exactly the same size, just in different places

```conllu
# sent_id = question:physics:39-day-and-night-and-the-moons-faces:t10:o4:1
# text = They really are exactly the same size, just in different places
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	7	nsubj	_	_
2	really	really	ADV	RB	_	7	advmod	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
4	exactly	exactly	ADV	RB	_	7	advmod	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	same	same	ADJ	JJ	Degree=Pos	7	amod	_	_
7	size	size	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
8	,	,	PUNCT	,	_	12	punct	_	_
9	just	just	ADV	RB	_	12	advmod	_	_
10	in	in	ADP	IN	_	12	case	_	_
11	different	different	ADJ	JJ	Degree=Pos	12	amod	_	_
12	places	place	NOUN	NNS	Number=Plur	7	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | They | the same size and different places |  |  |  | exactly *property* | tree rules |

<!-- div src -->

**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

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