608 
The Philippine Journal of Science 
Table 1. 
1920 
No. 
Date. 
Duration. 
Mirage. 
Type. 
Contacts. 
Remarks. 
Ob- 
served. 
Com- 
puted. 
Differ- 
ence. 
1 
2 
1918 
Seconds. 
Seconds. 
Seconds. 
1 
Dec. 22 
159.8 
147. 45 
+ 12.4. 
B 
1919 
2 
145.5 
146.6 
— 1.1 
1 
8 
156.5 
146.1 
+ 10.4 
0 
B 
Colton phenomena. 
4 
164.0 
146.7 
+ 18.3 
B 
5 
Jan. 18 
148.0 
144.3 
+ 3.7 
horizon. 
6 
147.0 
143.6 
+ 3.4 
0 
7 
146.0 
143.4 
+ 2.6 
0 
8 
169 0 
143.2 
+25.8 
0 
B 
9 
163 0 
143.0 
+20.0 
0 
1 ? 
10 
153.0 
142.4 
+ 10.6 
0 
B 
11 
150.5 
141.9 
+ 8.6 
0 
B 
Do. 
12 
152. 0 
141.4 
+ 10.6 
0 
B 
13 
Apr. 16 
133.0 
134.7 
- 1.7 
? 
A 
1 ? 
Mount Mirador. Colton 
phenomena. 
14 
Apr. 18 
136.5 
134.8 
+ 1.7 
A 
phenomena strong. 
15 
136 0 
135.0 
+ 1.0 
? 
1 ? 
Do. 
16 
Apr. 20 
158.0 
134.9 
+23.1 
? 
1 ? 
phenomena. 
17 
Apr. 21 
136.0 
136.2 
— 0.2 
A 
b 
18 
145.8 
148.6 
— 2.8 
0 
19 
147. 1 
148.9 
— 1.8 
0 
A 
1920 
20 
159.0 
148.5 
4-10 5 
0 
Slight rain. 
21 
Jan. 12 
150. 2 
145.8 
+ 4.4 
0 
a 
a 
22 
Jan. 18 
148.6 
144.4 
+ 4.1 
0 
B 
a 
a 1 
23 
Jan. 20 
143.6 
144.0 
— 0.4 
0 
a 
a 
Colton phenomena weak. 
24 
Jan. 21 
141.7 
143.9 
— 2.2 
2 
A 
b 
Colton phenomena 
marked. 
25 
Jan. 22 
142.3 
143.6 
— 1.3 
0 
A 
a 
a 
26 
143.0 
143.4 
— 0 4 
1 
A 
27 
Jan. 24 
142.9 
143.2 
— 0.8 
0 
A 
a 
28 
144. 1 
143.0 
+ 11 
0 
A 
29 
Jan. 26 
143.9 
142.9 
+ 1.0 
0 
A 
a 
30 
Jan. 27 
147. 1 
142.5 
+ 4. 6 
0 
B 
marked. 
31 
Jan. 28 
165.2 
142.2 
+23.0 
0 
B 
a 
a 
32 
163.0 
142. 1 
+ 20 9 
0 
B 
33 
145 1 
141.8 
+ 33 
0 
B 
Do. 
34 
Jan. 31 
156.6 
141.5 
+ 16.1 
0 
B 
a 
a 
Colton phenomena 
moderate. 
35 
Feb 1 
149. 5 
141.3 
+ 8.2 
0 
B 
36 
Feb. 2 
146.4 
141.1 
+ 4.3 
0 
B 
b 
37 
Apr. 2 
134.4 
134.4 
0.0 
0 
A 
a 
a 
San Fernando Point 
Lighthouse. 
38 
Apr. 3 
0 
A 
a 
a 
San Fernando. Colton 
phenomena weak. 
