diff --git a/bodies/earth.py b/bodies/earth.py
index eaf0b433db14e33908568999ea90fe538950804b..a261555f303381efb3b80108d17e899c14bd9562 100644
--- a/bodies/earth.py
+++ b/bodies/earth.py
@@ -23,7 +23,7 @@ class Earth(Body):
     　平均密度: 5507.85 kg/m³
     """
     def __init__(self, name="地球", mass=5.97237e24,rotate_angle=0,
-                 init_position=[0, 0, 1.12 * AU],
+                 init_position=[0, 0, 1 * AU],
                  init_velocity=[-29.79, 0, 0],
                  texture="earth1.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=15, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/jupiter.py b/bodies/jupiter.py
index e2ff6e80a98dbc4aed7e7aa297c6ebb87c239331..5e881f179b6d2a69d5900488c83af5c8469b2d39 100644
--- a/bodies/jupiter.py
+++ b/bodies/jupiter.py
@@ -23,7 +23,7 @@ class Jupiter(Body):
     　平均密度: 1.326 g/cm³ -> -> 1.326✕10³ kg/m³
     """
     def __init__(self, name="木星", mass=1.8982e27,
-                 init_position=[0, 0, 5.2 * AU],
+                 init_position=[0, 0, 5.19 * AU],
                  init_velocity=[-13.06, 0, 0],
                  texture="jupiter1.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=36.2537, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/mars.py b/bodies/mars.py
index abd1970a7ec16ae6b91b8082fc23afa72dc1bced..d96837d16ac4c1d9b21a4fe5a0ea437d4145bce1 100644
--- a/bodies/mars.py
+++ b/bodies/mars.py
@@ -23,7 +23,7 @@ class Mars(Body):
     　平均密度: 3.9335 g/cm³ -> 3.9335✕10³ kg/m³
     """
     def __init__(self, name="火星", mass=6.4171e23,
-                 init_position=[0, 0, 1.5 * AU],
+                 init_position=[0, 0, 1.52 * AU],
                  init_velocity=[-24.13, 0, 0],
                  texture="mars.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=14.6223, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/mercury.py b/bodies/mercury.py
index a463473a44d657893c1990f225caf54e05310576..e6cc8cf7fc7bbd44f238652e1b413f1892b40814 100644
--- a/bodies/mercury.py
+++ b/bodies/mercury.py
@@ -24,7 +24,7 @@ class Mercury(Body):
     """
 
     def __init__(self, name="水星", mass=3.3011e23,
-                 init_position=[0, 0, 0.4 * AU],
+                 init_position=[0, 0, 0.384 * AU],
                  init_velocity=[-47.87, 0, 0],
                  texture="mercury.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=0.2558, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/neptune.py b/bodies/neptune.py
index 13879e7e7e9ef1676ca0061758ecb646a64027f5..23647d471f1e9c51f54ac79d516d54b7ebfd67b1 100644
--- a/bodies/neptune.py
+++ b/bodies/neptune.py
@@ -24,7 +24,7 @@ class Neptune(Body):
     """
 
     def __init__(self, name="海王星", mass=1.0241e26,
-                 init_position=[0, 0, 30 * AU],
+                 init_position=[0, 0, 30.7 * AU],
                  init_velocity=[-5.43, 0, 0],
                  texture="neptune.png", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=22.3463, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/pluto.py b/bodies/pluto.py
index 734171a5a236d3124da89720f6dd1bb778e20223..c9c5451d2d7af2df92ed59ff34f38c33bcc3e64d 100644
--- a/bodies/pluto.py
+++ b/bodies/pluto.py
@@ -24,7 +24,7 @@ class Pluto(Body):
     """
 
     def __init__(self, name="冥王星", mass=1.303e22,
-                 init_position=[0, 0, 40 * AU],
+                 init_position=[0, 0, 39.55 * AU],
                  init_velocity=[-4.7, 0, 0],
                  texture="pluto.png", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=-2.3474, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/saturn.py b/bodies/saturn.py
index 457836ea683ba11c7f05169ce5cd05e3cd19f68a..4f9a8bb26797a07c2edca3a4c010e02208f7c071 100644
--- a/bodies/saturn.py
+++ b/bodies/saturn.py
@@ -24,7 +24,7 @@ class Saturn(Body):
     """
 
     def __init__(self, name="土星", mass=5.6834e26,
-                 init_position=[0, 0, 10 * AU],
+                 init_position=[0, 0, 9.5 * AU],
                  init_velocity=[-9.64, 0, 0],
                  texture="saturn.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=33.7711, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/uranus.py b/bodies/uranus.py
index f443d3e7afca615f3568e361f7b5869cd5b075b4..e592b3dbf751beec41a37e3f1cbd11076d3de48f 100644
--- a/bodies/uranus.py
+++ b/bodies/uranus.py
@@ -24,7 +24,7 @@ class Uranus(Body):
     """
 
     def __init__(self, name="天王星", mass=8.681e25,
-                 init_position=[0, 0, 19 * AU],
+                 init_position=[0, 0, 19.2 * AU],
                  init_velocity=[-6.81, 0, 0],
                  texture="uranus.png", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=-20.8816, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/bodies/venus.py b/bodies/venus.py
index 234feb46ac3740d368b66871c4f201330523fc34..4ca8454e836c9a89ffe4c1cc66465d4adb43990c 100644
--- a/bodies/venus.py
+++ b/bodies/venus.py
@@ -24,7 +24,7 @@ class Venus(Body):
     """
 
     def __init__(self, name="金星", mass=4.8675e24,
-                 init_position=[0, 0, 0.72 * AU],
+                 init_position=[0, 0, 0.721 * AU],
                  init_velocity=[-35, 0, 0],
                  texture="venus.jpg", size_scale=1.0, distance_scale=1.0,
                  rotation_speed=-0.0617, ignore_mass=False, trail_color=None, show_name=False):
diff --git a/common/singleton.py b/common/singleton.py
new file mode 100644
index 0000000000000000000000000000000000000000..2773ac54006b15ac2596f5c22ae2f309596b2866
--- /dev/null
+++ b/common/singleton.py
@@ -0,0 +1,19 @@
+# -*- coding:utf-8 -*-
+# title           :单例模式类
+# description     :单例模式类
+# author          :Python超人
+# date            :2023-02-11
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+
+
+class Singleton:
+    """
+    单例模式类
+    """
+
+    def __new__(cls, *args, **kwargs):
+        if not hasattr(cls, "_instance"):
+            cls._instance = super(Singleton, cls).__new__(cls)
+        return cls._instance
diff --git a/sim_scenes/func.py b/sim_scenes/func.py
index 60dac393c0021ce6ce92f59d05ef7076f851255d..7adb3b00e50d4b62f503bd10c42eaf10d0037e8f 100644
--- a/sim_scenes/func.py
+++ b/sim_scenes/func.py
@@ -109,7 +109,6 @@ def ursina_run(bodies,
             simulator.check_and_evolve()
             if ursina_view.appeared:
                 ursina_view.update()
-        # print('....')
 
     import sys
     sys.modules["__main__"].update = callback_update
diff --git a/sim_scenes/solar_system/speed_of_light.py b/sim_scenes/solar_system/speed_of_light.py
index b5e42571521a8782ee7b07ce23ea35bcfbd42869..c0b122ba0b64fbb1660f415d82863da39c5b9295 100644
--- a/sim_scenes/solar_system/speed_of_light.py
+++ b/sim_scenes/solar_system/speed_of_light.py
@@ -20,8 +20,8 @@ arrived_info = ""
 CAMERA_FOLLOW_LIGHT = None  # 不跟随光
 
 
-# CAMERA_FOLLOW_LIGHT = 'ForwardView'  # 向前看
-# CAMERA_FOLLOW_LIGHT = 'SideView'  # 侧面看
+CAMERA_FOLLOW_LIGHT = 'ForwardView'  # 向前看
+CAMERA_FOLLOW_LIGHT = 'SideView'  # 侧面看
 
 
 def on_reset():
diff --git a/simulators/ursina/entities/body_timer.py b/simulators/ursina/entities/body_timer.py
new file mode 100644
index 0000000000000000000000000000000000000000..af5763304f2791bf423cf7befe157ccb43b48347
--- /dev/null
+++ b/simulators/ursina/entities/body_timer.py
@@ -0,0 +1,79 @@
+# -*- coding:utf-8 -*-
+# title           :计时器天体
+# description     :计时器天体
+# author          :Python超人
+# date            :2023-02-11
+# link            :https://gitcode.net/pythoncr/
+# python_version  :3.8
+# ==============================================================================
+from bodies.body import Body
+from common.consts import MO
+from common.singleton import Singleton
+import os
+import random
+import math
+
+from simulators.ursina.ursina_event import UrsinaEvent
+
+
+class BodyTimer(Singleton):
+    """
+    天体计时器
+    """
+
+    def __init__(self):
+        if not hasattr(self, "inited"):
+            self.velocity_inc = 0.00001
+            UrsinaEvent.on_reset_subscription(self.reset)
+            UrsinaEvent.on_pause_subscription(self.pause)
+            UrsinaEvent.on_start_subscription(self.start)
+            self.inited = True
+
+    def pause(self):
+        pass
+
+    def start(self):
+        pass
+
+    def reset(self):
+        self.position_sum = 0.0
+
+    def calc_time(self, dt):
+        if not hasattr(self, "position_sum"):
+            self.position_sum = 0.0
+        self.position_sum += self.velocity_inc * dt
+        # 距离(km) / 速度(km/s) = 时间(s)
+        seconds = round(self.position_sum / self.velocity_inc)
+        hours, remainder = divmod(seconds, 3600)
+        minutes, seconds = divmod(remainder, 60)
+        days, hours = divmod(hours, 24)
+        years = days // 365
+        days = days % 365
+        if days > 1:
+            s_days = str(days).rjust(3, " ")
+            if days >= 20 or years >= 1:
+                self.text = f'{int(years)}年{s_days}天'
+            else:
+                self.text = f'{int(days)}天 {int(hours):02d}:{int(minutes):02d}:{int(seconds):02d}'
+        else:
+            self.text = f'{int(hours):02d}:{int(minutes):02d}:{int(seconds):02d}'
+
+        # print(self.text)
+        UrsinaEvent.on_timer_changed(self.text, (years, days, hours, minutes, seconds))
+
+    def ignore_gravity(self, body):
+        return True
+
+
+if __name__ == '__main__':
+    import time
+
+    t = BodyTimer()
+    print(id(t))
+    print(id(BodyTimer()))
+
+    for i in range(1000):
+        time.sleep(0.01)
+        # 距离(km) = 时间(s) * 速度(km/s)
+        t.position[0] += 300000 * t.velocity_inc
+        t.calc_time()
diff --git a/simulators/ursina/entities/timer.py b/simulators/ursina/entities/timer.py
deleted file mode 100644
index f4408db7f3ad01061520bedd03321200477f2381..0000000000000000000000000000000000000000
--- a/simulators/ursina/entities/timer.py
+++ /dev/null
@@ -1,75 +0,0 @@
-from ursina import Text, Ursina, application
-import datetime
-
-from simulators.ursina.ursina_config import UrsinaConfig
-from simulators.ursina.ursina_event import UrsinaEvent
-
-
-class Timer(Text):
-
-    def __init__(self):
-        # 创建一个文本对象来显示计时器的时间
-        super().__init__(text='00:00', position=(0.65, -0.45), font=UrsinaConfig.CN_FONT)
-        # 用来计时的变量
-        # self.start_time = time.time()
-        self.reset()
-        UrsinaEvent.on_evolving_subscription(self.update)
-        UrsinaEvent.on_reset_subscription(self.reset)
-        UrsinaEvent.on_pause_subscription(self.pause)
-        UrsinaEvent.on_start_subscription(self.start)
-        self.elapsed_time_offset = datetime.timedelta(microseconds=1)
-
-    def pause(self):
-        pass
-
-    def start(self):
-        self.last_time = datetime.datetime.now()
-
-    def reset(self):
-        self.last_time = datetime.datetime.now()
-        self.elapsed_time = datetime.timedelta(0)
-
-    def update(self, evolve_dt=1):
-        # # 计算当前的时间
-        # elapsed_time = time.time() - self.start_time
-        #
-        # # 将时间转换成“分钟：秒”的形式
-        # minutes = int(elapsed_time // 60)
-        # seconds = int(elapsed_time % 60)
-        # self.text = f'{minutes:02d}:{seconds:02d}'
-        time_scale = UrsinaConfig.get_app_time_scale()
-        current_time = datetime.datetime.now()
-        # 0.6 是对测试太阳系时间的纠正
-        self.elapsed_time += (current_time - self.last_time) * evolve_dt * time_scale * 0.6
-        # datetime.timedelta(microseconds=1)  0:00:00.000001
-        # datetime.timedelta(milliseconds=1)  0:00:00.001000
-        # self.elapsed_time += self.elapsed_time_offset  # 按区域取值
-        self.last_time = current_time
-        hours, remainder = divmod(self.elapsed_time.seconds, 3600)
-        minutes, seconds = divmod(remainder, 60)
-        days = self.elapsed_time.days
-        years = days // 365
-        days = days % 365
-        if days > 1:
-            s_days = str(days).rjust(3, " ")
-            if days >= 20 or years >= 1:
-                self.text = f'{years}年{s_days}天'
-            else:
-                self.text = f'{days}天 {hours:02d}:{minutes:02d}:{seconds:02d}'
-        else:
-            self.text = f'{hours:02d}:{minutes:02d}:{seconds:02d}'
-
-        UrsinaEvent.on_timer_changed(self.text, (years, days, hours, minutes, seconds))
-
-
-if __name__ == '__main__':
-    app = Ursina()
-
-    t = Timer()
-
-
-    def update():
-        t.update()
-
-
-    app.run()
diff --git a/simulators/ursina_simulator.py b/simulators/ursina_simulator.py
index ed1d5793f99d3fd4ead71c3f9fcb03c3e3718ae3..5ba3eedab1ef753d617b0b1c8b9b7299d1601ad1 100644
--- a/simulators/ursina_simulator.py
+++ b/simulators/ursina_simulator.py
@@ -14,7 +14,7 @@ from simulators.ursina.ursina_event import UrsinaEvent
 from simulators.ursina.ui.control_ui import ControlUI
 from simulators.ursina.ui.control_handler import ControlHandler
 from simulators.ursina.ursina_mesh import create_arrow_line
-
+from simulators.ursina.entities.body_timer import BodyTimer
 from simulators.views.ursina_view import UrsinaView
 from simulators.ursina.ursina_config import UrsinaConfig
 from simulators.simulator import Simulator
@@ -177,12 +177,16 @@ class UrsinaSimulator(Simulator):
             evolve_dt = evolve_dt * self.interval_fator
             super().evolve(evolve_dt)
 
+            if self.show_timer:
+                timer = BodyTimer()
+                timer.calc_time(evolve_dt)
+
 
-    def create_timer(self):
-        from simulators.ursina.entities.timer import Timer
-        # 创建一个文本对象来显示计时器的时间
-        self.timer = Timer()
-        return self.timer
+    # def create_timer(self):
+    #     from simulators.ursina.entities.timer import Timer
+    #     # 创建一个文本对象来显示计时器的时间
+    #     self.timer = Timer()
+    #     return self.timer
 
     def cosmic_background(self, texture='../textures/cosmic2.jpg'):
         """
@@ -222,9 +226,9 @@ class UrsinaSimulator(Simulator):
         if "view_closely" in kwargs:
             view_closely = kwargs["view_closely"]
 
-        show_timer = False
+        self.show_timer = False
         if "show_timer" in kwargs:
-            show_timer = kwargs["show_timer"]
+            self.show_timer = kwargs["show_timer"]
 
         if view_closely:
             # 近距离查看
@@ -278,8 +282,8 @@ class UrsinaSimulator(Simulator):
 
         # ui = UrsinaUI()
         ctl = ControlUI(ControlHandler(), position=(0.6, 0.5))
-        if show_timer:
-            self.create_timer()
+        # if show_timer:
+        #     self.create_timer()
 
         EditorCamera(ignore_paused=True)
         # 防止打开中文输入法
@@ -308,7 +312,7 @@ class UrsinaSimulator(Simulator):
             audio = Audio(bg_music, pitch=1, loop=True, autoplay=True)
             audio.volume = 0.3
 
-        if show_timer:
+        if self.show_timer:
             UrsinaEvent.on_reset()
 
         UrsinaEvent.on_ready()